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ecshop商品筛选功能实现代码示例

紫寒2024-12-11 13:29:37ecshop商城教程已有人查阅

导读一、首先,说明一下为什么要对category.php文件进行分析。原因如下:①个人对商城类商品筛选功能的实现比较好奇;②对商城中关于商品的数据表设计比较感兴趣。(该功能涉及到与

一、首先,说明一下为什么要对category.php文件进行分析。
原因如下:
①个人对商城类商品筛选功能的实现比较好奇;
②对商城中关于商品的数据表设计比较感兴趣。(该功能涉及到与数据库的交互,而且与数据库中数据表的设计好坏有一定的联系);
③多条件(属性)筛选功能在现今的很多网站都需要用到,很广泛(如:一般商城网、团购网、房产网、信息分类网站等等)。
希望达到的目的是:
①能够对多条件筛选功能有一个初步的认识。(起码自己做,也能够快速实现吧);
②对多条件筛选的实现中,数据库该如何去设计才会更优化和更合理些(参考前人的经验);
③对多条件筛选中的一些策略或者是技巧,能有一个了解(会总结几点)
二、然后,我们首先看一下现在需求是如何的?(多条件筛选,请参考京东、苏宁、国美等)
补充:其实,要对该功能的观察,还必须对地址栏,也作一番思考的,我这里就省略了,毕竟如果这样分析,会更简单一些。上面这些例子,只作一个引子吧。后续我会完善它的。
④ECSHOP的商品筛选功能实现,展示细节(截图+文字)如下:
1)首先,我本地服务器,给本机安装的ecshop演示网站,配了一个虚拟主机地址:
2)然后,我就通过该地址来访问主页,并查看属于导航栏中“GSM手机”分类下的商品。如下:
结果页面为:
那么,此时的访问,会罗列出,属于“GSM手机”分类下(即cat_id=3)的所有商品,因为目前还没有对商品进行多筛选。
如果我想查看品牌为“诺基亚”的手机,那么点击“诺基亚”标签即可:
结果页面为:
如果我选择了多条件搜索,
结果页面为:
分析:从上面的地址栏的变化和截图的变化,可以初步看出ecshop的多条件搜索方法是怎么样的了。
猜想1:随着用户每一次点击条件(属性)进行商品筛选时,搜索地址栏会变化,为什么地址栏会变化,归根结底,一定是每一个商品的属性的a标签的超链接地址被改变了。而且是每点击一次,都会随着搜索条件的不同,而改变。
从而我们知道,这个属性的超链接,是动态生成的。ecshop后台一定是作了大量的判断过程,并最终为每一个商品属性,生成一个超链接地址,以防止上一次的搜索条件丢失。
猜想2:商品的价格区间,是根据什么来计算的呢?还是人工后台设置的,京东的商品价格区间,好像都是很有规律的,和ecshop的价格区间,有比较大的区别。别管这么多了,我们还是先研究ecshop的再说。
猜想3:参数 filter_attr=163.0.160.0 中的几个数字,一定代表着下面:颜色、屏幕大小 、手机制式、外观样式属性下,都选择了哪一些值了。
----> 带着这样一些疑问,那我们直接去研究一下ecshop是如何实现上面的多条件搜索功能啦。。。GO。。。
首先,我们到ecshop的网站更目录,找到category.php文件,打开它进行研究一下。
1.点击这里,查看全部代码的分析过程。
1 <?php
  2 /**
  3  * 分析首页 商品分类页面category.php的实现方法
  4  * ECSHOP 2.7.2 商品分类
  5  */
  6 define('IN_ECS', true);
  7 require(dirname(__FILE__) . '/includes/init.php');
  8 if ((DEBUG_MODE & 2) != 2) {
  9     $smarty->caching = true;
 10 }
 11 
 12 //====> 请求地址栏:http://localhost/category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186
 13 //====> 1.获取分类id
 14 /* 获得请求的分类 ID */
 15 if (isset($_REQUEST['id'])) {
 16     $cat_id = intval($_REQUEST['id']);
 17 }
 18 elseif (isset($_REQUEST['category'])) {
 19     $cat_id = intval($_REQUEST['category']);
 20 } else {
 21     /* 如果分类ID为0,则返回首页 */
 22     ecs_header("Location: ./\n");
 23     exit;
 24 }
 25 
 26 //====> 2.首先获取所有GET和POST中,可用于搜索的参数的值。
 27 //====> 若没有此参数,则说明,并没有用此参数来搜索,默认要给它一个默认值。
 28 /* 初始化分页信息 */
 29 $page = isset($_REQUEST['page'])   && intval($_REQUEST['page'])  > 0 ? intval($_REQUEST['page'])  : 1;
 30 $size = isset($_CFG['page_size'])  && intval($_CFG['page_size']) > 0 ? intval($_CFG['page_size']) : 10;
 31 $brand = isset($_REQUEST['brand']) && intval($_REQUEST['brand']) > 0 ? intval($_REQUEST['brand']) : 0;
 32 $price_max = isset($_REQUEST['price_max']) && intval($_REQUEST['price_max']) > 0 ? intval($_REQUEST['price_max']) : 0;
 33 $price_min = isset($_REQUEST['price_min']) && intval($_REQUEST['price_min']) > 0 ? intval($_REQUEST['price_min']) : 0;
 34 $filter_attr_str = isset($_REQUEST['filter_attr']) ? htmlspecialchars(trim($_REQUEST['filter_attr'])) : '0';
 35 $filter_attr_str = urldecode($filter_attr_str);
 36 $filter_attr = empty($filter_attr_str) ? '' : explode('.', trim($filter_attr_str));
 37 
 38 /* 排序、显示方式以及类型 */
 39 $default_display_type = $_CFG['show_order_type'] == '0' ? 'list' : ($_CFG['show_order_type'] == '1' ? 'grid' : 'text');
 40 $default_sort_order_method = $_CFG['sort_order_method'] == '0' ? 'DESC' : 'ASC';
 41 $default_sort_order_type   = $_CFG['sort_order_type'] == '0' ? 'goods_id' : ($_CFG['sort_order_type'] == '1' ? 'shop_price' : 'last_update');
 42 
 43 $sort  = (isset($_REQUEST['sort'])  && in_array(trim(strtolower($_REQUEST['sort'])), array('goods_id', 'shop_price', 'last_update'))) ? trim($_REQUEST['sort'])  : $default_sort_order_type;
 44 $order = (isset($_REQUEST['order']) && in_array(trim(strtoupper($_REQUEST['order'])), array('ASC', 'DESC')))                              ? trim($_REQUEST['order']) : $default_sort_order_method;
 45 $display  = (isset($_REQUEST['display']) && in_array(trim(strtolower($_REQUEST['display'])), array('list', 'grid', 'text'))) ? trim($_REQUEST['display'])  : (isset($_COOKIE['ECS']['display']) ? $_COOKIE['ECS']['display'] : $default_display_type);
 46 $display  = in_array($display, array('list', 'grid', 'text')) ? $display : 'text';
 47 setcookie('ECS[display]', $display, gmtime() + 86400 * 7);
 48 
 49 /* 页面的缓存ID */
 50 $cache_id = sprintf('%X', crc32($cat_id . '-' . $display . '-' . $sort  .'-' . $order  .'-' . $page . '-' . $size . '-' . $_SESSION['user_rank'] . '-' .
 51         $_CFG['lang'] .'-'. $brand. '-' . $price_max . '-' .$price_min . '-' . $filter_attr_str));
 52 
 53 /* 如果页面没有被缓存则重新获取页面的内容 */
 54 if (!$smarty->is_cached('category.dwt', $cache_id)) {
 55 //====> 3.把该栏目下的所有子栏目id获取,如果没有子栏目,则是自身。
 56 //===> TABLE:ecs_category
 57 //====> RETURN:id=3 => g.cat_id IN ('3')  或 id=6 => g.cat_id IN ('6','8','9','11','7')
 58 //====> 说明:ecshop的特点是,顶级栏目下也可以添加商品,所以会把顶级栏目id也放在数组里面
 59 $children = get_children($cat_id);  
 60 
 61 //====> 4.获得该分类的相关信息。如:分类名称、价格分级、筛选属性、父id
 62 //===> TABLE:ecs_category
 63 //====> RETURN:Array ( [cat_name] => GSM手机 [keywords] => [cat_desc] => [style] => [grade] => 4 [filter_attr] => 185,189,173,178 [parent_id] => 1 )
 64 $cat = get_cat_info($cat_id);   
 65 
 66 //===> 5.如果有品牌筛选brand参数,那么获取出该品牌名称
 67 //===> TABLE:ecs_brand
 68 //===> SQL:SELECT brand_name FROM `ecshop`.`ecs_brand` WHERE brand_id = '1'
 69 //====> RETURN:诺基亚
 70  /* 赋值固定内容 */
 71 if ($brand > 0) {
 72     $sql = "SELECT brand_name FROM " .$GLOBALS['ecs']->table('brand'). " WHERE brand_id = '$brand'";
 73     $brand_name = $db->getOne($sql);
 74 } else {
 75     $brand_name = '';
 76 }
 77 
 78 
 79 ///>>================开始---商品价格区间处理==================>>///
 80 //===> 6.获取该分类cat的价格分级:
 81 //===> ①如果价格分级=0,那么获取直接父类的价格分级。(Ⅰ如果父类价格也=0,那么就是不用价格分级 )
 82 //===> ②如果价格分级!=0,那么就是自身的价格分级。
 83 //===> TABLE:ecs_category
 84 //===> RETURN:$cat['grade']=4
 85 /* 获取价格分级 */
 86 if ($cat['grade'] == 0  && $cat['parent_id'] != 0) { //  ==>如果价格分级为空,但是它还有上级分类,那么取直接上级的价格分级等数
 87     $cat['grade'] = get_parent_grade($cat_id); //如果当前分类级别为空,取最近的上级分类
 88 }
 89 
 90 //===> 7.对价格区间进行划分。 ecshop的划分方法,是根据算法来的,比较复杂。
 91 //===> 如果价格分级>1,那么就执行价格区间划分
 92 if ($cat['grade'] > 1) {
 93     /* 需要价格分级 */
 94 
 95     /*
 96      算法思路:
 97     1、当分级大于1时,进行价格分级
 98     2、取出该类下商品价格的最大值、最小值
 99     3、根据商品价格的最大值来计算商品价格的分级数量级:
100     价格范围(不含最大值)    分级数量级
101     0-0.1                   0.001
102     0.1-1                   0.01
103     1-10                    0.1
104     10-100                  1
105     100-1000                10
106     1000-10000              100
107     4、计算价格跨度:
108     取整((最大值-最小值) / (价格分级数) / 数量级) * 数量级
109     5、根据价格跨度计算价格范围区间
110     6、查询数据库
111 
112     可能存在问题:
113     1、
114     由于价格跨度是由最大值、最小值计算出来的
115     然后再通过价格跨度来确定显示时的价格范围区间
116     所以可能会存在价格分级数量不正确的问题
117     该问题没有证明
118     2、
119     当价格=最大值时,分级会多出来,已被证明存在
120     */
121     
122     //===> 获得当前分类下商品价格的最大值、最小值
123     //===> 获得所有扩展分类属于指定分类的所有商品ID ,其中goods_id = 16的商品的扩展属于分类3
124     //===> TABLE:ecs_goods 和 ecs_goods_cat
125     //===> SQL:SELECT min(g.shop_price) AS min, max(g.shop_price) as max FROM `ecshop`.`ecs_goods` AS g WHERE (g.cat_id IN ('5') OR g.goods_id IN ('8','16') ) AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1
126     //===> RETURN:Array ( [min] => 280.00 [max] => 5999.00 ) 
127     $sql = "SELECT min(g.shop_price) AS min, max(g.shop_price) as max ".
128             " FROM " . $ecs->table('goods'). " AS g ".
129             " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1  ';
130     $row = $db->getRow($sql);
131 
132     
133     //===> 按照公式计算出最低价格和最高价格、以及价格跨度
134     //===============↓↓↓先不做讨论===============
135     // 取得价格分级最小单位级数,比如,千元商品最小以100为级数
136     $price_grade = 0.0001;
137     for($i=-2; $i<= log10($row['max']); $i++) {
138         $price_grade *= 10;
139     }
140     
141     //价格跨度
142     $dx = ceil(($row['max'] - $row['min']) / ($cat['grade']) / $price_grade) * $price_grade;
143     if($dx == 0) {
144         $dx = $price_grade;
145     }
146     
147     for($i = 1; $row['min'] > $dx * $i; $i ++);
148     
149         for($j = 1; $row['min'] > $dx * ($i-1) + $price_grade * $j; $j++);
150         $row['min'] = $dx * ($i-1) + $price_grade * ($j - 1);
151     
152         for(; $row['max'] >= $dx * $i; $i ++);
153         $row['max'] = $dx * ($i) + $price_grade * ($j - 1);
154 
155         //===>这里打印最高价格和最低价格:$row=>Array ( [min] => 200 [max] => 6200 ) 
156         //===>这里打印价格跨度:$dx = 1500
157         
158         //===============先不做讨论↑↑↑==================//
159     
160 
161         //===> 根据商品的价格、价格区间的最低价格、以及价格跨度,计算该商品价格属于哪一个区间内。
162         //===> 获取属于该价格区间内的商品的数量、获取sn则属于哪一个区间sn=0为200-1700、sn=1为1700-3200、sn=3为4700-6200。
163         //===> 因为没有商品价格属于第二区间,则不存在sn=2,那么3200-4700则没有任何商品
164         //===> TABLE:ecs_goods 和 ecs_goods_cat
165         //===> SQL:SELECT (FLOOR((g.shop_price - 200) / 1500)) AS sn, COUNT(*) AS goods_num FROM `ecshop`.`ecs_goods` AS g WHERE (g.cat_id IN ('3') OR g.goods_id IN ('16') ) AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 GROUP BY sn 
166         //===>RETURN:Array ( [0] => Array ( [sn] => 0 [goods_num] => 6 ) [1] => Array ( [sn] => 1 [goods_num] => 5 ) [2] => Array ( [sn] => 3 [goods_num] => 1 ) ) 
167         $sql = "SELECT (FLOOR((g.shop_price - $row[min]) / $dx)) AS sn, COUNT(*) AS goods_num  ".
168                 " FROM " . $ecs->table('goods') . " AS g ".
169                 " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 '.
170                 " GROUP BY sn ";
171         $price_grade = $db->getAll($sql);
172 
173         
174         //===> 根据价格等级price_grade,计算真正的价格区间。
175         //===> 方法build_uri()重要:要为每一个价格区间,生成一个url超链接,以备前台点击搜索用
176         //===> 并根据价格参数,判断该区间,是否是当前被搜索的区间
177         //===> 把价格区间,注入模板,供前台使用
178         //===> RETURN:Array ( [0] => Array ( [sn] => 0 [goods_num] => 6 [start] => 0 [end] => 0 [price_range] => 全部 [url] => category.php?id=3&brand=1&price_min=0&price_max=0&filter_attr=163.216.160.186 [selected] => 0 ) [1] => Array ( [sn] => 1 [goods_num] => 6 [start] => 200 [end] => 1700 [price_range] => 200 - 1700 [formated_start] => ¥200元 [formated_end] => ¥1700元 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [2] => Array ( [sn] => 3 [goods_num] => 5 [start] => 1700 [end] => 3200 [price_range] => 1700 - 3200 [formated_start] => ¥1700元 [formated_end] => ¥3200元 [url] => category.php?id=3&brand=1&price_min=1700&price_max=3200&filter_attr=163.216.160.186 [selected] => 0 ) [3] => Array ( [goods_num] => 1 [start] => 4700 [end] => 6200 [price_range] => 4700 - 6200 [formated_start] => ¥4700元 [formated_end] => ¥6200元 [url] => category.php?id=3&brand=1&price_min=4700&price_max=6200&filter_attr=163.216.160.186 [selected] => 0 ) ) 
179         foreach ($price_grade as $key=>$val) {
180             $temp_key = $key + 1;
181             $price_grade[$temp_key]['goods_num'] = $val['goods_num'];
182             $price_grade[$temp_key]['start'] = $row['min'] + round($dx * $val['sn']);
183             $price_grade[$temp_key]['end'] = $row['min'] + round($dx * ($val['sn'] + 1));
184             $price_grade[$temp_key]['price_range'] = $price_grade[$temp_key]['start'] . ' - ' . $price_grade[$temp_key]['end'];
185             $price_grade[$temp_key]['formated_start'] = price_format($price_grade[$temp_key]['start']);
186             $price_grade[$temp_key]['formated_end'] = price_format($price_grade[$temp_key]['end']);
187             $price_grade[$temp_key]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_grade[$temp_key]['start'], 'price_max'=> $price_grade[$temp_key]['end'], 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
188             /* 判断价格区间是否被选中 */
189             if (isset($_REQUEST['price_min']) && $price_grade[$temp_key]['start'] == $price_min && $price_grade[$temp_key]['end'] == $price_max) {
190                 $price_grade[$temp_key]['selected'] = 1;
191             }
192             else {
193                 $price_grade[$temp_key]['selected'] = 0;
194             }
195         }
196         //补充一个选择全部的类型的数组
197         $price_grade[0]['start'] = 0;
198         $price_grade[0]['end'] = 0;
199         $price_grade[0]['price_range'] = $_LANG['all_attribute'];
200         $price_grade[0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>0, 'price_max'=> 0, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
201         $price_grade[0]['selected'] = empty($price_max) ? 1 : 0;
202         //把价格区间数组,注入模板文件
203         $smarty->assign('price_grade',     $price_grade);
204     }
205     ///<<================结束---商品价格区间处理==================<<///
206     
207     
208     ///>>================开始---商品品牌处理==================>>///
209     //====> ???db_create_in(array_unique(array_merge(array($cat_id), array_keys(cat_list($cat_id, 0, false))))) . ")
210     //===> 品牌筛选功能:把该栏目下(其中包括扩展分类下的商品),所有商品的品牌获取,但不能重复。
211     //===> 品牌下有商品并且商品状态正常,才能把该品牌取出。没有商品的品牌不能取出
212     //===> TABLE:ecs_brand、ecs_goods 和 ecs_goods_cat
213     //===> SQL:SELECT b.brand_id, b.brand_name, COUNT(*) AS goods_num FROM `ecshop`.`ecs_brand`AS b, `ecshop`.`ecs_goods` AS g LEFT JOIN `ecshop`.`ecs_goods_cat` AS gc ON g.goods_id = gc.goods_id WHERE g.brand_id = b.brand_id AND (g.cat_id IN ('3') OR gc.cat_id IN ('3') ) AND b.is_show = 1 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 AND g.is_delete = 0 GROUP BY b.brand_id HAVING goods_num > 0 ORDER BY b.sort_order, b.brand_id ASC
214     //===> RETURN:Array ( [0] => Array ( [brand_id] => 1 [brand_name] => 诺基亚 [goods_num] => 3 ) [1] => Array ( [brand_id] => 2 [brand_name] => 摩托罗拉 [goods_num] => 1 ) [2] => Array ( [brand_id] => 3 [brand_name] => 多普达 [goods_num] => 1 ) [3] => Array ( [brand_id] => 4 [brand_name] => 飞利浦 [goods_num] => 2 ) [4] => Array ( [brand_id] => 5 [brand_name] => 夏新 [goods_num] => 1 ) [5] => Array ( [brand_id] => 6 [brand_name] => 三星 [goods_num] => 2 ) [6] => Array ( [brand_id] => 7 [brand_name] => 索爱 [goods_num] => 1 ) [7] => Array ( [brand_id] => 9 [brand_name] => 联想 [goods_num] => 1 ) [8] => Array ( [brand_id] => 10 [brand_name] => 金立 [goods_num] => 1 ) ) 
215     /* 品牌筛选 */
216     $sql = "SELECT b.brand_id, b.brand_name, COUNT(*) AS goods_num ".
217             "FROM " . $GLOBALS['ecs']->table('brand') . "AS b, ".
218             $GLOBALS['ecs']->table('goods') . " AS g LEFT JOIN ". $GLOBALS['ecs']->table('goods_cat') . " AS gc ON g.goods_id = gc.goods_id " .
219             "WHERE g.brand_id = b.brand_id AND ($children OR " . 'gc.cat_id ' . db_create_in(array_unique(array_merge(array($cat_id), array_keys(cat_list($cat_id, 0, false))))) . ") AND b.is_show = 1 " .
220             " AND g.is_on_sale = 1 AND g.is_alone_sale = 1 AND g.is_delete = 0 ".
221             "GROUP BY b.brand_id HAVING goods_num > 0 ORDER BY b.sort_order, b.brand_id ASC";
222     $brands = $GLOBALS['db']->getAll($sql);
223 
224     //===> 把该分类下所有商品的品牌,组合成数组,给前台调用
225     //===> 方法build_uri()重要:要为每品牌,生成一个url超链接,以备前台点击搜索用
226     //===> 把数组注入模板文件
227     //====! 这样一种组织数组的方式,有它的缺陷:就是说不能够把每一个品牌下面的,商品的数量保存下来,同时也会有一些无用的数据,掺杂其中。
228     //RETURN:Array ( [0] => Array ( [brand_id] => 1 [brand_name] => 全部 [goods_num] => 3 [url] => category.php?id=3&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [1] => Array ( [brand_id] => 2 [brand_name] => 诺基亚 [goods_num] => 1 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [2] => Array ( [brand_id] => 3 [brand_name] => 摩托罗拉 [goods_num] => 1 [url] => category.php?id=3&brand=2&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [3] => Array ( [brand_id] => 4 [brand_name] => 多普达 [goods_num] => 2 [url] => category.php?id=3&brand=3&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [4] => Array ( [brand_id] => 5 [brand_name] => 飞利浦 [goods_num] => 1 [url] => category.php?id=3&brand=4&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [5] => Array ( [brand_id] => 6 [brand_name] => 夏新 [goods_num] => 2 [url] => category.php?id=3&brand=5&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [6] => Array ( [brand_id] => 7 [brand_name] => 三星 [goods_num] => 1 [url] => category.php?id=3&brand=6&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [7] => Array ( [brand_id] => 9 [brand_name] => 索爱 [goods_num] => 1 [url] => category.php?id=3&brand=7&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [8] => Array ( [brand_id] => 10 [brand_name] => 联想 [goods_num] => 1 [url] => category.php?id=3&brand=9&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [9] => Array ( [brand_name] => 金立 [url] => category.php?id=3&brand=10&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) ) 
229     foreach ($brands AS $key => $val) {
230         $temp_key = $key + 1;
231         $brands[$temp_key]['brand_name'] = $val['brand_name'];
232         $brands[$temp_key]['url'] = build_uri('category', array('cid' => $cat_id, 'bid' => $val['brand_id'], 'price_min'=>$price_min, 'price_max'=> $price_max, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
233         /* 判断品牌是否被选中 */
234         if ($brand == $brands[$key]['brand_id']) {
235             $brands[$temp_key]['selected'] = 1;
236         } else {
237             $brands[$temp_key]['selected'] = 0;
238         }
239     }
240     //补充一个选择全部品牌的数组
241     $brands[0]['brand_name'] = $_LANG['all_attribute'];
242     $brands[0]['url'] = build_uri('category', array('cid' => $cat_id, 'bid' => 0, 'price_min'=>$price_min, 'price_max'=> $price_max, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
243     $brands[0]['selected'] = empty($brand) ? 1 : 0;
244     //把品牌数组注入模板
245     $smarty->assign('brands', $brands);
246     ///<<==================结束---商品品牌处理==================<<///
247     
248     
249 
250     ///>>==================开始---商品属性处理==================>>///
251     /* 属性筛选 */
252     $ext = ''; //商品查询条件扩展
253     if ($cat['filter_attr'] > 0) {
254         //===>需要筛选的属性,是人工在后台添加的,存放在ecs_category 表的中 filter_attr字段里面,格式如:185,189,120,190
255         //===>RETURN:Array ( [0] => 185 [1] => 189 [2] => 173 [3] => 178 )
256         $cat_filter_attr = explode(',', $cat['filter_attr']);       //提取出此分类的筛选属性
257         
258         //===> 然后,对每一个属性(此属性是主属性,下面还有子属性),循环进行操作
259         //===> ①获取该属性的属性名
260         //===> ②获取该属性的所有子属性(子属性必须是有被商品在使用的,不然,不要将其显示出来)
261         //===> 意义:因为该属性涉及到搜索参数,如果该属性下本身没有商品,那么就没有显示出来的意义了。
262         //===> RETURN: Array ( [0] => Array ( [attr_id] => 185 [goods_id] => 167 [attr_value] => 灰色 ) [1] => Array ( [attr_id] => 185 [goods_id] => 198 [attr_value] => 白色 ) [2] => Array ( [attr_id] => 185 [goods_id] => 197 [attr_value] => 金色 ) [3] => Array ( [attr_id] => 185 [goods_id] => 163 [attr_value] => 黑色 ) ) 
263         $all_attr_list = array();
264         foreach ($cat_filter_attr AS $key => $value) { 
265             $sql = "SELECT a.attr_name FROM " . $ecs->table('attribute') . " AS a, " . $ecs->table('goods_attr') . " AS ga, " . $ecs->table('goods') . " AS g WHERE ($children OR " . get_extension_goods($children) . ") AND a.attr_id = ga.attr_id AND g.goods_id = ga.goods_id AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 AND a.attr_id='$value'";
266             if($temp_name = $db->getOne($sql)) {
267                 //获取该属性名(主属性)
268                 $all_attr_list[$key]['filter_attr_name'] = $temp_name;  
269                 
270                 //获取该属性的所有子属性(子属性必须是有被商品在使用的,不然,不要将其显示出来)
271                 //RETURN: Array ( [0] => Array ( [attr_id] => 185 [goods_id] => 167 [attr_value] => 灰色 ) [1] => Array ( [attr_id] => 185 [goods_id] => 198 [attr_value] => 白色 ) [2] => Array ( [attr_id] => 185 [goods_id] => 197 [attr_value] => 金色 ) [3] => Array ( [attr_id] => 185 [goods_id] => 163 [attr_value] => 黑色 ) )
272                 $sql = "SELECT a.attr_id, MIN(a.goods_attr_id ) AS goods_id, a.attr_value AS attr_value FROM " . $ecs->table('goods_attr') . " AS a, " . $ecs->table('goods') .
273                 " AS g" .
274                 " WHERE ($children OR " . get_extension_goods($children) . ') AND g.goods_id = a.goods_id AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 '.
275                 " AND a.attr_id='$value' ".
276                 " GROUP BY a.attr_value";
277                 $attr_list = $db->getAll($sql);
278     
279                 //如果后台指定该分类下,用于搜索的属性的组数,是跟地址栏中filter_attr=0.0.0.0  中0的个数是一样的,而且顺序都是一样的
280                 //第一个0,表示第一组属性中,它选择了哪一个子属性,以此类推
281                 //获取当前url中已选择属性的值,并保留在数组中
282                 //!这里要作循环,是因为避免属性为0或者空时,导致出错,因为直接把$filter_attr 赋值给 $temp_arrt_url_arr会出错。
283                 //RETURN:Array ( [0] => 163 [1] => 216 [2] => 160 [3] => 186 ) 
284                 $temp_arrt_url_arr = array();
285                 for ($i = 0; $i < count($cat_filter_attr); $i++) {     
286                     $temp_arrt_url_arr[$i] = !empty($filter_attr[$i]) ? $filter_attr[$i] : 0;  
287                 }
288     
289                 //这里是该属性下,选择全部时的数组形式
290                 //哪一个属性的值为0,即说明用户选择的是该属性的全部选项
291                 //为“全部”生成url
292                 //DATA:Array ( [0] => 0 [1] => 216 [2] => 160 [3] => 186 ) 
293                 $temp_arrt_url_arr[$key] = 0;    //“全部”的信息生成 
294                 $temp_arrt_url = implode('.', $temp_arrt_url_arr);
295                 $all_attr_list[$key]['attr_list'][0]['attr_value'] = $_LANG['all_attribute'];
296                 $all_attr_list[$key]['attr_list'][0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_min, 'price_max'=>$price_max, 'filter_attr'=>$temp_arrt_url), $cat['cat_name']);
297                 $all_attr_list[$key]['attr_list'][0]['selected'] = empty($filter_attr[$key]) ? 1 : 0;
298     
299                 //循环计算子属性的相关数组:属性值,属性是否选择,属性的url
300                 //判断当前子属性,是否被选中状态
301                 //RETURN:Array ( [0] => Array ( [filter_attr_name] => 颜色 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=0.216.160.186 [selected] => 0 ) [1] => Array ( [attr_value] => 灰色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=167.216.160.186 [selected] => 0 ) [2] => Array ( [attr_value] => 白色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=198.216.160.186 [selected] => 0 ) [3] => Array ( [attr_value] => 金色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=197.216.160.186 [selected] => 0 ) [4] => Array ( [attr_value] => 黑色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) ) ) [1] => Array ( [filter_attr_name] => 屏幕大小 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.0.160.186 [selected] => 0 ) [1] => Array ( [attr_value] => 1.75英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.229.160.186 [selected] => 0 ) [2] => Array ( [attr_value] => 2.0英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [3] => Array ( [attr_value] => 2.2英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.223.160.186 [selected] => 0 ) [4] => Array ( [attr_value] => 2.6英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.156.160.186 [selected] => 0 ) [5] => Array ( [attr_value] => 2.8英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.200.160.186 [selected] => 0 ) ) ) [2] => Array ( [filter_attr_name] => 手机制式 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.0.186 [selected] => 0 ) [1] => Array ( [attr_value] => CDMA [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.202.186 [selected] => 0 ) [2] => Array ( [attr_value] => GSM,850,900,1800,1900 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [3] => Array ( [attr_value] => GSM,900,1800,1900,2100 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.195.186 [selected] => 0 ) ) ) [3] => Array ( [filter_attr_name] => 外观样式 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.0 [selected] => 0 ) [1] => Array ( [attr_value] => 滑盖 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.199 [selected] => 0 ) [2] => Array ( [attr_value] => 直板 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) ) ) ) 
302                 foreach ($attr_list as $k => $v) {
303                     $temp_key = $k + 1;
304                     $temp_arrt_url_arr[$key] = $v['goods_id'];       //为url中代表当前筛选属性的位置变量赋值,并生成以‘.’分隔的筛选属性字符串
305                     $temp_arrt_url = implode('.', $temp_arrt_url_arr);
306     
307                     $all_attr_list[$key]['attr_list'][$temp_key]['attr_value'] = $v['attr_value'];
308                     $all_attr_list[$key]['attr_list'][$temp_key]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_min, 'price_max'=>$price_max, 'filter_attr'=>$temp_arrt_url), $cat['cat_name']);
309     
310                     if (!empty($filter_attr[$key]) AND $filter_attr[$key] == $v['goods_id']) { //处理已被选择的子属性
311                         $all_attr_list[$key]['attr_list'][$temp_key]['selected'] = 1;
312                     }
313                     else {
314                         $all_attr_list[$key]['attr_list'][$temp_key]['selected'] = 0;
315                     }
316                 }
317             }
318         }
319         //为模板注入变量
320         $smarty->assign('filter_attr_list',  $all_attr_list);
321         
322         
323         /* 扩展商品查询条件 */
324         if (!empty($filter_attr)) {
325             $ext_sql = "SELECT DISTINCT(b.goods_id) FROM " . $ecs->table('goods_attr') . " AS a, " . $ecs->table('goods_attr') . " AS b " .  "WHERE ";
326             $ext_group_goods = array();
327             foreach ($filter_attr AS $k => $v) { // 查出符合所有筛选属性条件的商品id */
328                 if (is_numeric($v) && $v !=0 ) {
329                     $sql = $ext_sql . "b.attr_value = a.attr_value AND b.attr_id = " . $cat_filter_attr[$k] ." AND a.goods_attr_id = " . $v;
330                     $ext_group_goods = $db->getColCached($sql);
331                     $ext .= ' AND ' . db_create_in($ext_group_goods, 'g.goods_id');
332                 }
333             }
334         }
335     } 
336     ///<<==================结束---商品属性处理==================///
337     
338     //向模板,载入一些前台,必备的变量和常量
339     assign_template('c', array($cat_id));
340     
341     //RETURN:Array ( [title] => 夏新_GSM手机_手机类型_ECSHOP演示站 - Powered by ECShop [ur_here] => 首页 > 手机类型 > GSM手机 > 夏新 )
342     $position = assign_ur_here($cat_id, $brand_name);
343     
344     $smarty->assign('page_title',       $position['title']);    // 页面标题
345     $smarty->assign('ur_here',          $position['ur_here']);  // 当前位置
346     
347     $smarty->assign('categories',       get_categories_tree($cat_id)); // 分类树
348     $smarty->assign('helps',            get_shop_help());              // 网店帮助
349     $smarty->assign('top_goods',        get_top10());                  // 销售排行
350     $smarty->assign('show_marketprice', $_CFG['show_marketprice']); //是否显示市场价
351     $smarty->assign('category',         $cat_id);
352     $smarty->assign('brand_id',         $brand);
353     $smarty->assign('price_max',        $price_max);
354     $smarty->assign('price_min',        $price_min);
355     $smarty->assign('filter_attr',      $filter_attr_str);
356     $smarty->assign('feed_url',         ($_CFG['rewrite'] == 1) ? "feed-c$cat_id.xml" : 'feed.php?cat=' . $cat_id); // RSS URL
357     
358     if ($brand > 0) {
359         $arr['all'] = array('brand_id'  => 0,
360                 'brand_name'    => $GLOBALS['_LANG']['all_goods'],
361                 'brand_logo'    => '',
362                 'goods_num'     => '',
363                 'url'           => build_uri('category', array('cid'=>$cat_id), $cat['cat_name'])
364         );
365     } else {
366         $arr = array();
367     }
368     
369     $brand_list = array_merge($arr, get_brands($cat_id, 'category'));
370     $smarty->assign('data_dir',    DATA_DIR); //网站data目录
371     $smarty->assign('brand_list',      $brand_list);
372     $smarty->assign('promotion_info', get_promotion_info()); //获取推荐信息
373     
374     /* 调查 */
375     $vote = get_vote();
376     if (!empty($vote)) {
377         $smarty->assign('vote_id',     $vote['id']);
378         $smarty->assign('vote',        $vote['content']);
379     }
380     
381     //获取最热销、推荐和最热卖商品
382     $smarty->assign('best_goods',      get_category_recommend_goods('best', $children, $brand, $price_min, $price_max, $ext));
383     $smarty->assign('promotion_goods', get_category_recommend_goods('promote', $children, $brand, $price_min, $price_max, $ext));
384     $smarty->assign('hot_goods',       get_category_recommend_goods('hot', $children, $brand, $price_min, $price_max, $ext));
385     //获取该前状态下,商品的数量
386     $count = get_cagtegory_goods_count($children, $brand, $price_min, $price_max, $ext);
387     //最大页数
388     $max_page = ($count> 0) ? ceil($count / $size) : 1;
389     if ($page > $max_page) {
390         $page = $max_page;
391     }
392     
393     //获取该栏目下的所有商品
394     $goodslist = category_get_goods($children, $brand, $price_min, $price_max, $ext, $size, $page, $sort, $order);
395     
396     //判断选择了列表还是图片方式显示方式
397     if($display == 'grid') {
398         if(count($goodslist) % 2 != 0) {
399             $goodslist[] = array();
400         }
401     }
402     
403     $smarty->assign('goods_list',       $goodslist); //注入商品列表
404     $smarty->assign('category',         $cat_id); //注入分类id
405     $smarty->assign('script_name', 'category'); //注入该脚本的名称
406     
407     assign_pager('category',            $cat_id, $count, $size, $sort, $order, $page, '', $brand, $price_min, $price_max, $display, $filter_attr_str); // 分页
408     assign_dynamic('category'); // 动态内容
409 }
410 $smarty->display('category.dwt', $cache_id);
411 ?>
2.分步分析其实现过程:
1)第一步,首先,文件一开头,一定是接收前台页面发送过来的各种POST和GET参数了,这里主要还是指地址栏GET方式传过来的参数了。
//====> 2.首先获取所有GET和POST中,可用于搜索的参数的值。
//====> 若没有此参数,则说明,并没有用此参数来搜索,默认要给它一个默认值。
/* 初始化分页信息 */
$page = isset($_REQUEST['page'])   && intval($_REQUEST['page'])  > 0 ? intval($_REQUEST['page'])  : 1;
$size = isset($_CFG['page_size'])  && intval($_CFG['page_size']) > 0 ? intval($_CFG['page_size']) : 10;
$brand = isset($_REQUEST['brand']) && intval($_REQUEST['brand']) > 0 ? intval($_REQUEST['brand']) : 0;
$price_max = isset($_REQUEST['price_max']) && intval($_REQUEST['price_max']) > 0 ? intval($_REQUEST['price_max']) : 0;
$price_min = isset($_REQUEST['price_min']) && intval($_REQUEST['price_min']) > 0 ? intval($_REQUEST['price_min']) : 0;
$filter_attr_str = isset($_REQUEST['filter_attr']) ? htmlspecialchars(trim($_REQUEST['filter_attr'])) : '0';
$filter_attr_str = urldecode($filter_attr_str);
$filter_attr = empty($filter_attr_str) ? '' : explode('.', trim($filter_attr_str));

/* 排序、显示方式以及类型 */
$default_display_type = $_CFG['show_order_type'] == '0' ? 'list' : ($_CFG['show_order_type'] == '1' ? 'grid' : 'text');
$default_sort_order_method = $_CFG['sort_order_method'] == '0' ? 'DESC' : 'ASC';
$default_sort_order_type   = $_CFG['sort_order_type'] == '0' ? 'goods_id' : ($_CFG['sort_order_type'] == '1' ? 'shop_price' : 'last_update');

$sort  = (isset($_REQUEST['sort'])  && in_array(trim(strtolower($_REQUEST['sort'])), array('goods_id', 'shop_price', 'last_update'))) ? trim($_REQUEST['sort'])  : $default_sort_order_type;
$order = (isset($_REQUEST['order']) && in_array(trim(strtoupper($_REQUEST['order'])), array('ASC', 'DESC')))                              ? trim($_REQUEST['order']) : $default_sort_order_method;
$display  = (isset($_REQUEST['display']) && in_array(trim(strtolower($_REQUEST['display'])), array('list', 'grid', 'text'))) ? trim($_REQUEST['display'])  : (isset($_COOKIE['ECS']['display']) ? $_COOKIE['ECS']['display'] : $default_display_type);
$display  = in_array($display, array('list', 'grid', 'text')) ? $display : 'text';
setcookie('ECS[display]', $display, gmtime() + 86400 * 7);
2)第二步,处理商品分类参数,并获取该分类的详细信息:
//====> 3.把该栏目下的所有子栏目id获取,如果没有子栏目,则是自身。
//===> TABLE:ecs_category
//====> RETURN:id=3 => g.cat_id IN ('3')  或 id=6 => g.cat_id IN ('6','8','9','11','7')
//====> 说明:ecshop的特点是,顶级栏目下也可以添加商品,所以会把顶级栏目id也放在数组里面
$children = get_children($cat_id);

//====> 4.获得该分类的相关信息。如:分类名称、价格分级、筛选属性、父id
//===> TABLE:ecs_category
//====> RETURN:Array ( [cat_name] => GSM手机 [keywords] => [cat_desc] => [style] => [grade] => 4 [filter_attr] => 185,189,173,178 [parent_id] => 1 )
$cat = get_cat_info($cat_id);
3)第三步,处理价格,并对商品价格进行区间的划分:
///>>================开始---商品价格区间处理==================>>///
//===> 6.获取该分类cat的价格分级:
//===> ①如果价格分级=0,那么获取直接父类的价格分级。(Ⅰ如果父类价格也=0,那么就是不用价格分级 )
//===> ②如果价格分级!=0,那么就是自身的价格分级。
//===> TABLE:ecs_category
//===> RETURN:$cat['grade']=4
/* 获取价格分级 */
if ($cat['grade'] == 0  && $cat['parent_id'] != 0) { //  ==>如果价格分级为空,但是它还有上级分类,那么取直接上级的价格分级等数
    $cat['grade'] = get_parent_grade($cat_id); //如果当前分类级别为空,取最近的上级分类
}

//===> 7.对价格区间进行划分。 ecshop的划分方法,是根据算法来的,比较复杂。
//===> 如果价格分级>1,那么就执行价格区间划分
if ($cat['grade'] > 1) {
    /* 需要价格分级 */

    /*
     算法思路:
    1、当分级大于1时,进行价格分级
    2、取出该类下商品价格的最大值、最小值
    3、根据商品价格的最大值来计算商品价格的分级数量级:
    价格范围(不含最大值)    分级数量级
    0-0.1                   0.001
    0.1-1                   0.01
    1-10                    0.1
    10-100                  1
    100-1000                10
    1000-10000              100
    4、计算价格跨度:
    取整((最大值-最小值) / (价格分级数) / 数量级) * 数量级
    5、根据价格跨度计算价格范围区间
    6、查询数据库

    可能存在问题:
    1、
    由于价格跨度是由最大值、最小值计算出来的
    然后再通过价格跨度来确定显示时的价格范围区间
    所以可能会存在价格分级数量不正确的问题
    该问题没有证明
    2、
    当价格=最大值时,分级会多出来,已被证明存在
    */

    //===> 获得当前分类下商品价格的最大值、最小值
    //===> 获得所有扩展分类属于指定分类的所有商品ID ,其中goods_id = 16的商品的扩展属于分类3
    //===> TABLE:ecs_goods 和 ecs_goods_cat
    //===> SQL:SELECT min(g.shop_price) AS min, max(g.shop_price) as max FROM `ecshop`.`ecs_goods` AS g WHERE (g.cat_id IN ('5') OR g.goods_id IN ('8','16') ) AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1
    //===> RETURN:Array ( [min] => 280.00 [max] => 5999.00 )
    $sql = "SELECT min(g.shop_price) AS min, max(g.shop_price) as max ".
            " FROM " . $ecs->table('goods'). " AS g ".
            " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1  ';
    $row = $db->getRow($sql);


    //===> 按照公式计算出最低价格和最高价格、以及价格跨度
    //===============↓↓↓先不做讨论===============
    // 取得价格分级最小单位级数,比如,千元商品最小以100为级数
    $price_grade = 0.0001;
    for($i=-2; $i<= log10($row['max']); $i++) {
        $price_grade *= 10;
    }

    //价格跨度
    $dx = ceil(($row['max'] - $row['min']) / ($cat['grade']) / $price_grade) * $price_grade;
    if($dx == 0) {
        $dx = $price_grade;
    }

    for($i = 1; $row['min'] > $dx * $i; $i ++);

        for($j = 1; $row['min'] > $dx * ($i-1) + $price_grade * $j; $j++);
        $row['min'] = $dx * ($i-1) + $price_grade * ($j - 1);

        for(; $row['max'] >= $dx * $i; $i ++);
        $row['max'] = $dx * ($i) + $price_grade * ($j - 1);

        //===>这里打印最高价格和最低价格:$row=>Array ( [min] => 200 [max] => 6200 )
        //===>这里打印价格跨度:$dx = 1500

        //===============先不做讨论↑↑↑==================//


        //===> 根据商品的价格、价格区间的最低价格、以及价格跨度,计算该商品价格属于哪一个区间内。
        //===> 获取属于该价格区间内的商品的数量、获取sn则属于哪一个区间sn=0为200-1700、sn=1为1700-3200、sn=3为4700-6200。
        //===> 因为没有商品价格属于第二区间,则不存在sn=2,那么3200-4700则没有任何商品
        //===> TABLE:ecs_goods 和 ecs_goods_cat
        //===> SQL:SELECT (FLOOR((g.shop_price - 200) / 1500)) AS sn, COUNT(*) AS goods_num FROM `ecshop`.`ecs_goods` AS g WHERE (g.cat_id IN ('3') OR g.goods_id IN ('16') ) AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 GROUP BY sn
        //===>RETURN:Array ( [0] => Array ( [sn] => 0 [goods_num] => 6 ) [1] => Array ( [sn] => 1 [goods_num] => 5 ) [2] => Array ( [sn] => 3 [goods_num] => 1 ) )
        $sql = "SELECT (FLOOR((g.shop_price - $row[min]) / $dx)) AS sn, COUNT(*) AS goods_num  ".
                " FROM " . $ecs->table('goods') . " AS g ".
                " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 '.
                " GROUP BY sn ";
        $price_grade = $db->getAll($sql);


        //===> 根据价格等级price_grade,计算真正的价格区间。
        //===> 方法build_uri()重要:要为每一个价格区间,生成一个url超链接,以备前台点击搜索用
        //===> 并根据价格参数,判断该区间,是否是当前被搜索的区间
        //===> 把价格区间,注入模板,供前台使用
        //===> RETURN:Array ( [0] => Array ( [sn] => 0 [goods_num] => 6 [start] => 0 [end] => 0 [price_range] => 全部 [url] => category.php?id=3&brand=1&price_min=0&price_max=0&filter_attr=163.216.160.186 [selected] => 0 ) [1] => Array ( [sn] => 1 [goods_num] => 6 [start] => 200 [end] => 1700 [price_range] => 200 - 1700 [formated_start] => ¥200元 [formated_end] => ¥1700元 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [2] => Array ( [sn] => 3 [goods_num] => 5 [start] => 1700 [end] => 3200 [price_range] => 1700 - 3200 [formated_start] => ¥1700元 [formated_end] => ¥3200元 [url] => category.php?id=3&brand=1&price_min=1700&price_max=3200&filter_attr=163.216.160.186 [selected] => 0 ) [3] => Array ( [goods_num] => 1 [start] => 4700 [end] => 6200 [price_range] => 4700 - 6200 [formated_start] => ¥4700元 [formated_end] => ¥6200元 [url] => category.php?id=3&brand=1&price_min=4700&price_max=6200&filter_attr=163.216.160.186 [selected] => 0 ) )
        foreach ($price_grade as $key=>$val) {
            $temp_key = $key + 1;
            $price_grade[$temp_key]['goods_num'] = $val['goods_num'];
            $price_grade[$temp_key]['start'] = $row['min'] + round($dx * $val['sn']);
            $price_grade[$temp_key]['end'] = $row['min'] + round($dx * ($val['sn'] + 1));
            $price_grade[$temp_key]['price_range'] = $price_grade[$temp_key]['start'] . ' - ' . $price_grade[$temp_key]['end'];
            $price_grade[$temp_key]['formated_start'] = price_format($price_grade[$temp_key]['start']);
            $price_grade[$temp_key]['formated_end'] = price_format($price_grade[$temp_key]['end']);
            $price_grade[$temp_key]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_grade[$temp_key]['start'], 'price_max'=> $price_grade[$temp_key]['end'], 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
            /* 判断价格区间是否被选中 */
            if (isset($_REQUEST['price_min']) && $price_grade[$temp_key]['start'] == $price_min && $price_grade[$temp_key]['end'] == $price_max) {
                $price_grade[$temp_key]['selected'] = 1;
            }
            else {
                $price_grade[$temp_key]['selected'] = 0;
            }
        }
        //补充一个选择全部的类型的数组
        $price_grade[0]['start'] = 0;
        $price_grade[0]['end'] = 0;
        $price_grade[0]['price_range'] = $_LANG['all_attribute'];
        $price_grade[0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>0, 'price_max'=> 0, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
        $price_grade[0]['selected'] = empty($price_max) ? 1 : 0;
        //把价格区间数组,注入模板文件
        $smarty->assign('price_grade',     $price_grade);
    }
    ///<<================结束---商品价格区间处理==================<<///
4)第四步,处理品牌,并为每一个品牌生成url。
///>>================开始---商品品牌处理==================>>///
    //====> ???db_create_in(array_unique(array_merge(array($cat_id), array_keys(cat_list($cat_id, 0, false))))) . ")
    //===> 品牌筛选功能:把该栏目下(其中包括扩展分类下的商品),所有商品的品牌获取,但不能重复。
    //===> 品牌下有商品并且商品状态正常,才能把该品牌取出。没有商品的品牌不能取出
    //===> TABLE:ecs_brand、ecs_goods 和 ecs_goods_cat
    //===> SQL:SELECT b.brand_id, b.brand_name, COUNT(*) AS goods_num FROM `ecshop`.`ecs_brand`AS b, `ecshop`.`ecs_goods` AS g LEFT JOIN `ecshop`.`ecs_goods_cat` AS gc ON g.goods_id = gc.goods_id WHERE g.brand_id = b.brand_id AND (g.cat_id IN ('3') OR gc.cat_id IN ('3') ) AND b.is_show = 1 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 AND g.is_delete = 0 GROUP BY b.brand_id HAVING goods_num > 0 ORDER BY b.sort_order, b.brand_id ASC
    //===> RETURN:Array ( [0] => Array ( [brand_id] => 1 [brand_name] => 诺基亚 [goods_num] => 3 ) [1] => Array ( [brand_id] => 2 [brand_name] => 摩托罗拉 [goods_num] => 1 ) [2] => Array ( [brand_id] => 3 [brand_name] => 多普达 [goods_num] => 1 ) [3] => Array ( [brand_id] => 4 [brand_name] => 飞利浦 [goods_num] => 2 ) [4] => Array ( [brand_id] => 5 [brand_name] => 夏新 [goods_num] => 1 ) [5] => Array ( [brand_id] => 6 [brand_name] => 三星 [goods_num] => 2 ) [6] => Array ( [brand_id] => 7 [brand_name] => 索爱 [goods_num] => 1 ) [7] => Array ( [brand_id] => 9 [brand_name] => 联想 [goods_num] => 1 ) [8] => Array ( [brand_id] => 10 [brand_name] => 金立 [goods_num] => 1 ) )
    /* 品牌筛选 */
    $sql = "SELECT b.brand_id, b.brand_name, COUNT(*) AS goods_num ".
            "FROM " . $GLOBALS['ecs']->table('brand') . "AS b, ".
            $GLOBALS['ecs']->table('goods') . " AS g LEFT JOIN ". $GLOBALS['ecs']->table('goods_cat') . " AS gc ON g.goods_id = gc.goods_id " .
            "WHERE g.brand_id = b.brand_id AND ($children OR " . 'gc.cat_id ' . db_create_in(array_unique(array_merge(array($cat_id), array_keys(cat_list($cat_id, 0, false))))) . ") AND b.is_show = 1 " .
            " AND g.is_on_sale = 1 AND g.is_alone_sale = 1 AND g.is_delete = 0 ".
            "GROUP BY b.brand_id HAVING goods_num > 0 ORDER BY b.sort_order, b.brand_id ASC";
    $brands = $GLOBALS['db']->getAll($sql);

    //===> 把该分类下所有商品的品牌,组合成数组,给前台调用
    //===> 方法build_uri()重要:要为每品牌,生成一个url超链接,以备前台点击搜索用
    //===> 把数组注入模板文件
    //====! 这样一种组织数组的方式,有它的缺陷:就是说不能够把每一个品牌下面的,商品的数量保存下来,同时也会有一些无用的数据,掺杂其中。
    //RETURN:Array ( [0] => Array ( [brand_id] => 1 [brand_name] => 全部 [goods_num] => 3 [url] => category.php?id=3&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [1] => Array ( [brand_id] => 2 [brand_name] => 诺基亚 [goods_num] => 1 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [2] => Array ( [brand_id] => 3 [brand_name] => 摩托罗拉 [goods_num] => 1 [url] => category.php?id=3&brand=2&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [3] => Array ( [brand_id] => 4 [brand_name] => 多普达 [goods_num] => 2 [url] => category.php?id=3&brand=3&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [4] => Array ( [brand_id] => 5 [brand_name] => 飞利浦 [goods_num] => 1 [url] => category.php?id=3&brand=4&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [5] => Array ( [brand_id] => 6 [brand_name] => 夏新 [goods_num] => 2 [url] => category.php?id=3&brand=5&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [6] => Array ( [brand_id] => 7 [brand_name] => 三星 [goods_num] => 1 [url] => category.php?id=3&brand=6&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [7] => Array ( [brand_id] => 9 [brand_name] => 索爱 [goods_num] => 1 [url] => category.php?id=3&brand=7&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [8] => Array ( [brand_id] => 10 [brand_name] => 联想 [goods_num] => 1 [url] => category.php?id=3&brand=9&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) [9] => Array ( [brand_name] => 金立 [url] => category.php?id=3&brand=10&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 0 ) )
    foreach ($brands AS $key => $val) {
        $temp_key = $key + 1;
        $brands[$temp_key]['brand_name'] = $val['brand_name'];
        $brands[$temp_key]['url'] = build_uri('category', array('cid' => $cat_id, 'bid' => $val['brand_id'], 'price_min'=>$price_min, 'price_max'=> $price_max, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
        /* 判断品牌是否被选中 */
        if ($brand == $brands[$key]['brand_id']) {
            $brands[$temp_key]['selected'] = 1;
        } else {
            $brands[$temp_key]['selected'] = 0;
        }
    }
    //补充一个选择全部品牌的数组
    $brands[0]['brand_name'] = $_LANG['all_attribute'];
    $brands[0]['url'] = build_uri('category', array('cid' => $cat_id, 'bid' => 0, 'price_min'=>$price_min, 'price_max'=> $price_max, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
    $brands[0]['selected'] = empty($brand) ? 1 : 0;
    //把品牌数组注入模板
    $smarty->assign('brands', $brands);
    ///<<==================结束---商品品牌处理==================<<///
5)第五步,处理商品的属性,并为每一个属性生成url。
///>>==================开始---商品属性处理==================>>///
    /* 属性筛选 */
    $ext = ''; //商品查询条件扩展
    if ($cat['filter_attr'] > 0) {
        //===>需要筛选的属性,是人工在后台添加的,存放在ecs_category 表的中 filter_attr字段里面,格式如:185,189,120,190
        //===>RETURN:Array ( [0] => 185 [1] => 189 [2] => 173 [3] => 178 )
        $cat_filter_attr = explode(',', $cat['filter_attr']);       //提取出此分类的筛选属性

        //===> 然后,对每一个属性(此属性是主属性,下面还有子属性),循环进行操作
        //===> ①获取该属性的属性名
        //===> ②获取该属性的所有子属性(子属性必须是有被商品在使用的,不然,不要将其显示出来)
        //===> 意义:因为该属性涉及到搜索参数,如果该属性下本身没有商品,那么就没有显示出来的意义了。
        //===> RETURN: Array ( [0] => Array ( [attr_id] => 185 [goods_id] => 167 [attr_value] => 灰色 ) [1] => Array ( [attr_id] => 185 [goods_id] => 198 [attr_value] => 白色 ) [2] => Array ( [attr_id] => 185 [goods_id] => 197 [attr_value] => 金色 ) [3] => Array ( [attr_id] => 185 [goods_id] => 163 [attr_value] => 黑色 ) )
        $all_attr_list = array();
        foreach ($cat_filter_attr AS $key => $value) {
            $sql = "SELECT a.attr_name FROM " . $ecs->table('attribute') . " AS a, " . $ecs->table('goods_attr') . " AS ga, " . $ecs->table('goods') . " AS g WHERE ($children OR " . get_extension_goods($children) . ") AND a.attr_id = ga.attr_id AND g.goods_id = ga.goods_id AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 AND a.attr_id='$value'";
            if($temp_name = $db->getOne($sql)) {
                //获取该属性名(主属性)
                $all_attr_list[$key]['filter_attr_name'] = $temp_name;

                //获取该属性的所有子属性(子属性必须是有被商品在使用的,不然,不要将其显示出来)
                //RETURN: Array ( [0] => Array ( [attr_id] => 185 [goods_id] => 167 [attr_value] => 灰色 ) [1] => Array ( [attr_id] => 185 [goods_id] => 198 [attr_value] => 白色 ) [2] => Array ( [attr_id] => 185 [goods_id] => 197 [attr_value] => 金色 ) [3] => Array ( [attr_id] => 185 [goods_id] => 163 [attr_value] => 黑色 ) )
                $sql = "SELECT a.attr_id, MIN(a.goods_attr_id ) AS goods_id, a.attr_value AS attr_value FROM " . $ecs->table('goods_attr') . " AS a, " . $ecs->table('goods') .
                " AS g" .
                " WHERE ($children OR " . get_extension_goods($children) . ') AND g.goods_id = a.goods_id AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 '.
                " AND a.attr_id='$value' ".
                " GROUP BY a.attr_value";
                $attr_list = $db->getAll($sql);

                //如果后台指定该分类下,用于搜索的属性的组数,是跟地址栏中filter_attr=0.0.0.0  中0的个数是一样的,而且顺序都是一样的
                //第一个0,表示第一组属性中,它选择了哪一个子属性,以此类推
                //获取当前url中已选择属性的值,并保留在数组中
                //!这里要作循环,是因为避免属性为0或者空时,导致出错,因为直接把$filter_attr 赋值给 $temp_arrt_url_arr会出错。
                //RETURN:Array ( [0] => 163 [1] => 216 [2] => 160 [3] => 186 )
                $temp_arrt_url_arr = array();
                for ($i = 0; $i < count($cat_filter_attr); $i++) {
                    $temp_arrt_url_arr[$i] = !empty($filter_attr[$i]) ? $filter_attr[$i] : 0;
                }

                //这里是该属性下,选择全部时的数组形式
                //哪一个属性的值为0,即说明用户选择的是该属性的全部选项
                //为“全部”生成url
                //DATA:Array ( [0] => 0 [1] => 216 [2] => 160 [3] => 186 )
                $temp_arrt_url_arr[$key] = 0;    //“全部”的信息生成
                $temp_arrt_url = implode('.', $temp_arrt_url_arr);
                $all_attr_list[$key]['attr_list'][0]['attr_value'] = $_LANG['all_attribute'];
                $all_attr_list[$key]['attr_list'][0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_min, 'price_max'=>$price_max, 'filter_attr'=>$temp_arrt_url), $cat['cat_name']);
                $all_attr_list[$key]['attr_list'][0]['selected'] = empty($filter_attr[$key]) ? 1 : 0;

                //循环计算子属性的相关数组:属性值,属性是否选择,属性的url
                //判断当前子属性,是否被选中状态
                //RETURN:Array ( [0] => Array ( [filter_attr_name] => 颜色 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=0.216.160.186 [selected] => 0 ) [1] => Array ( [attr_value] => 灰色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=167.216.160.186 [selected] => 0 ) [2] => Array ( [attr_value] => 白色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=198.216.160.186 [selected] => 0 ) [3] => Array ( [attr_value] => 金色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=197.216.160.186 [selected] => 0 ) [4] => Array ( [attr_value] => 黑色 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) ) ) [1] => Array ( [filter_attr_name] => 屏幕大小 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.0.160.186 [selected] => 0 ) [1] => Array ( [attr_value] => 1.75英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.229.160.186 [selected] => 0 ) [2] => Array ( [attr_value] => 2.0英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [3] => Array ( [attr_value] => 2.2英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.223.160.186 [selected] => 0 ) [4] => Array ( [attr_value] => 2.6英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.156.160.186 [selected] => 0 ) [5] => Array ( [attr_value] => 2.8英寸 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.200.160.186 [selected] => 0 ) ) ) [2] => Array ( [filter_attr_name] => 手机制式 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.0.186 [selected] => 0 ) [1] => Array ( [attr_value] => CDMA [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.202.186 [selected] => 0 ) [2] => Array ( [attr_value] => GSM,850,900,1800,1900 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) [3] => Array ( [attr_value] => GSM,900,1800,1900,2100 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.195.186 [selected] => 0 ) ) ) [3] => Array ( [filter_attr_name] => 外观样式 [attr_list] => Array ( [0] => Array ( [attr_value] => 全部 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.0 [selected] => 0 ) [1] => Array ( [attr_value] => 滑盖 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.199 [selected] => 0 ) [2] => Array ( [attr_value] => 直板 [url] => category.php?id=3&brand=1&price_min=200&price_max=1700&filter_attr=163.216.160.186 [selected] => 1 ) ) ) )
                foreach ($attr_list as $k => $v) {
                    $temp_key = $k + 1;
                    $temp_arrt_url_arr[$key] = $v['goods_id'];       //为url中代表当前筛选属性的位置变量赋值,并生成以‘.’分隔的筛选属性字符串
                    $temp_arrt_url = implode('.', $temp_arrt_url_arr);

                    $all_attr_list[$key]['attr_list'][$temp_key]['attr_value'] = $v['attr_value'];
                    $all_attr_list[$key]['attr_list'][$temp_key]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_min, 'price_max'=>$price_max, 'filter_attr'=>$temp_arrt_url), $cat['cat_name']);

                    if (!empty($filter_attr[$key]) AND $filter_attr[$key] == $v['goods_id']) { //处理已被选择的子属性
                        $all_attr_list[$key]['attr_list'][$temp_key]['selected'] = 1;
                    }
                    else {
                        $all_attr_list[$key]['attr_list'][$temp_key]['selected'] = 0;
                    }
                }
            }
        }
        //为模板注入变量
        $smarty->assign('filter_attr_list',  $all_attr_list);


        /* 扩展商品查询条件 */
        if (!empty($filter_attr)) {
            $ext_sql = "SELECT DISTINCT(b.goods_id) FROM " . $ecs->table('goods_attr') . " AS a, " . $ecs->table('goods_attr') . " AS b " .  "WHERE ";
            $ext_group_goods = array();
            foreach ($filter_attr AS $k => $v) { // 查出符合所有筛选属性条件的商品id */
                if (is_numeric($v) && $v !=0 ) {
                    $sql = $ext_sql . "b.attr_value = a.attr_value AND b.attr_id = " . $cat_filter_attr[$k] ." AND a.goods_attr_id = " . $v;
                    $ext_group_goods = $db->getColCached($sql);
                    $ext .= ' AND ' . db_create_in($ext_group_goods, 'g.goods_id');
                }
            }
        }
    }
    ///<<==================结束---商品属性处理==================///
6)第六步,根据以上计算的条件,查询商品列表,并计算商品的数量等等,把变量注入模板中去。
//向模板,载入一些前台,必备的变量和常量
    assign_template('c', array($cat_id));

    //RETURN:Array ( [title] => 夏新_GSM手机_手机类型_ECSHOP演示站 - Powered by ECShop [ur_here] => 首页 > 手机类型 > GSM手机 > 夏新 )
    $position = assign_ur_here($cat_id, $brand_name);

    $smarty->assign('page_title',       $position['title']);    // 页面标题
    $smarty->assign('ur_here',          $position['ur_here']);  // 当前位置

    $smarty->assign('categories',       get_categories_tree($cat_id)); // 分类树
    $smarty->assign('helps',            get_shop_help());              // 网店帮助
    $smarty->assign('top_goods',        get_top10());                  // 销售排行
    $smarty->assign('show_marketprice', $_CFG['show_marketprice']); //是否显示市场价
    $smarty->assign('category',         $cat_id);
    $smarty->assign('brand_id',         $brand);
    $smarty->assign('price_max',        $price_max);
    $smarty->assign('price_min',        $price_min);
    $smarty->assign('filter_attr',      $filter_attr_str);
    $smarty->assign('feed_url',         ($_CFG['rewrite'] == 1) ? "feed-c$cat_id.xml" : 'feed.php?cat=' . $cat_id); // RSS URL

    if ($brand > 0) {
        $arr['all'] = array('brand_id'  => 0,
                'brand_name'    => $GLOBALS['_LANG']['all_goods'],
                'brand_logo'    => '',
                'goods_num'     => '',
                'url'           => build_uri('category', array('cid'=>$cat_id), $cat['cat_name'])
        );
    } else {
        $arr = array();
    }

    $brand_list = array_merge($arr, get_brands($cat_id, 'category'));
    $smarty->assign('data_dir',    DATA_DIR); //网站data目录
    $smarty->assign('brand_list',      $brand_list);
    $smarty->assign('promotion_info', get_promotion_info()); //获取推荐信息

    /* 调查 */
    $vote = get_vote();
    if (!empty($vote)) {
        $smarty->assign('vote_id',     $vote['id']);
        $smarty->assign('vote',        $vote['content']);
    }

    //获取最热销、推荐和最热卖商品
    $smarty->assign('best_goods',      get_category_recommend_goods('best', $children, $brand, $price_min, $price_max, $ext));
    $smarty->assign('promotion_goods', get_category_recommend_goods('promote', $children, $brand, $price_min, $price_max, $ext));
    $smarty->assign('hot_goods',       get_category_recommend_goods('hot', $children, $brand, $price_min, $price_max, $ext));
    //获取该前状态下,商品的数量
    $count = get_cagtegory_goods_count($children, $brand, $price_min, $price_max, $ext);
    //最大页数
    $max_page = ($count> 0) ? ceil($count / $size) : 1;
    if ($page > $max_page) {
        $page = $max_page;
    }

    //获取该栏目下的所有商品
    $goodslist = category_get_goods($children, $brand, $price_min, $price_max, $ext, $size, $page, $sort, $order);

    //判断选择了列表还是图片方式显示方式
    if($display == 'grid') {
        if(count($goodslist) % 2 != 0) {
            $goodslist[] = array();
        }
    }

    $smarty->assign('goods_list',       $goodslist); //注入商品列表
    $smarty->assign('category',         $cat_id); //注入分类id
    $smarty->assign('script_name', 'category'); //注入该脚本的名称

    assign_pager('category',            $cat_id, $count, $size, $sort, $order, $page, '', $brand, $price_min, $price_max, $display, $filter_attr_str); // 分页
    assign_dynamic('category'); // 动态内容
}
$smarty->display('category.dwt', $cache_id);
说明:以上的代码中,都有对其实现方法,有非常具体的说明,详情请见代码的备注。
总结:分析都之后,其实我有些些失望了,因为这个所谓多条件搜索功能的实现,并不算是很复杂,很高深的东西,都比较简单(和我的想法差不多)。
不过,我也学到了一些东西,具体如下:
① 对Ecshop商品主要数据表的设计有了了解。(下一篇会简单介绍)
② 原来这里的要对商品的那些属性进行筛选,并不是程序自动处理,而是管理员后台指定的。
③ 价格区间的计算,是按照一定的算法计算出来的,比较智能,但数字不太好看(另外一种策略,是自己后台为每一个商品分类,都指定一个价格区间,也是可以的。)
④ 品牌、价格区间和属性,都是按照一定的原则从数据库抽取出来的。即,这些说有的分类或者属性下,必须是有商品的,才会把它获取出来。比如,如果颜色为黑色的属性下面是没有任何商品的,那么黑色这个属性,就不应该显示出来。其他依次类推。
⑤ 对于一些较为复杂的mysql语句查询,有了一些了解(希望不断提高啦。。)

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