PHP之多条件混合筛选功能的实现方法

<style type="text/css" 

.search_text{ overflow:hidden; height:100%; padding-top:5px; padding-bottom:5px;}
.search_text h1{ color:#6a6a6a; font-weight:bold; float:left; font-size:14px; margin:0px; padding:0px;}
.search_text ul{ margin:0; padding:0; list-style:none; float:left; overflow:hidden; height:100%;}
.search_text li{ list-style:none; color:#6a6a6a; float:left; width:80px; padding-left:8px; padding-right:5px; white-space:nowrap}
.search_text li a{ list-style:none; color:#6a6a6a;}
.search_text li a:hover{ list-style:none; color:#fe8f01; font-weight:bold; text-decoration:underline;}
.search_text li.selected{color:#fe8f01; font-weight:bold;}
.search_text li.selected a{color:#fe8f01;}
.search_text li.selected a:hover{color:#fe8f01;}
</style 

<div class="search_text" id="year" 
<h1 生产年度：</h1 
<ul 
<li class="selected" <a href="javascript:goSort('year',0)" rel="external nofollow"  全部</a </li 
<li <a href="javascript:goSort('year',1)" rel="external nofollow"  2015</a </li 
<li <a href="javascript:goSort('year',2)" rel="external nofollow"  2014</a </li 
</ul 
</div 
<div class="search_text" id="ctype" 
<h1 棉花类型：</h1 
<ul 
<li class="selected" <a href="javascript:goSort('ctype',0);" rel="external nofollow"  全部</a  </li 
<li <a href="javascript:goSort('ctype',1);" rel="external nofollow"  手采棉</a </li 
<li <a href="javascript:goSort('ctype',2);" rel="external nofollow"  机采棉</a </li 
</li 
</ul 
</div 
<div class="search_text" id="colors" 
<h1 颜 色 级 ：</h1 
<ul 
<li class="selected" <a href="javascript:goSort('colors',0);" rel="external nofollow"  全部</a  </li 
<li <a href="javascript:goSort('colors',1);" rel="external nofollow"  白棉1级</a </li 
<li <a href="javascript:goSort('colors',2);" rel="external nofollow"  白棉2级</a </li 
<li <a href="javascript:goSort('colors',3);" rel="external nofollow"  白棉3级</a </li 
<li <a href="javascript:goSort('colors',4);" rel="external nofollow"  白棉4级</a </li 
<li <a href="javascript:goSort('colors',5);" rel="external nofollow"  白棉5级</a </li 
<li <a href="javascript:goSort('colors',6);" rel="external nofollow"  淡点污棉1级</a </li 
</ul 
</div 
<div class="search_text" id="lengths" 
<h1 长 度 级 ：</h1 
<ul 
<li class="selected" <a href="javascript:goSort('lengths',0);" rel="external nofollow"  全部</a  </li 
<li <a href="javascript:goSort('lengths',1);" rel="external nofollow"  26CM</a </li 
<li <a href="javascript:goSort('lengths',2);" rel="external nofollow"  27CM</a </li 
<li <a href="javascript:goSort('lengths',3);" rel="external nofollow"  28CM</a </li 
<li <a href="javascript:goSort('lengths',4);" rel="external nofollow"  29CM</a </li 
<li <a href="javascript:goSort('lengths',5);" rel="external nofollow"  30CM</a </li 
<li <a href="javascript:goSort('lengths',6);" rel="external nofollow"  31CM</a </li 
<li <a href="javascript:goSort('lengths',7);" rel="external nofollow"  32CM</a </li 
</ul 
</div 
<div class="search_text" id="micronaire" 
<h1 马克隆值：</h1 
<ul 
<li class="selected" <a href="javascript:goSort('micronaire',0);" rel="external nofollow"  全部</a  </li 
<li <a href="javascript:goSort('micronaire',1);" rel="external nofollow"  C2</a </li 
<li <a href="javascript:goSort('micronaire',2);" rel="external nofollow"  B2</a </li 
<li <a href="javascript:goSort('micronaire',3);" rel="external nofollow"  A</a </li 
<li <a href="javascript:goSort('micronaire',4);" rel="external nofollow"  B1</a </li 
<li <a href="javascript:goSort('micronaire',5);" rel="external nofollow"  C1</a </li 
</ul 
</div 

<script language="javascript" 
function getQueryString(){
var result = location.search.match(new RegExp("[\?\&][^\?\&]+=[^\?\&]+","g"));
if(result == null){
return "";
}
for(var i = 0; i < result.length; i++){
result[i] = result[i].substring(1);
}
return result;
}
function goSort(name,value){
var string_array = getQueryString();
var oldUrl = (document.URL.indexOf("cotton.php")==-1)?document.URL+"cotton.php":document.URL;
var newUrl;
if(string_array.length 0)//如果已经有筛选条件
{  var repeatField = false;
for(var i=0;i<string_array.length;i++){
if(!(string_array[i].indexOf(name)==-1)){
repeatField = true;//如果有重复筛选条件，替换条件值
newUrl = oldUrl.replace(string_array[i],name+"="+value);
}
}
//如果没有重复的筛选字段
if(repeatField == false){
newUrl = oldUrl+"&"+name+"="+value;
}
}else{//如果还没有筛选条件
newUrl = oldUrl+"?"+name+"="+value;
}
//跳转
window.location = newUrl;
}
function setSelected(name,value){
var all_li = $("#"+name).find("li");
//清除所有li标签的selected类
all_li.each(function(){
$(this).removeClass("selected");
});
//为选中的li增加selected类
all_li.eq(value).addClass("selected");
}
$(document).ready(function(){
var string_array = getQueryString();
for(var i=0;i<string_array.length;i++){
var tempArr = string_array[i].split("=");
setSelected(tempArr[0],tempArr[1]);//设置选中的筛选条件
}
});
</script  

<?php
/**
*加入搜索条件
*/
$where ="1";
$year_array = array(1= '2015',2= '2014');
$ctype_array = array(1= '0',2= '1');
$colors_array = array(1= '0',2= '1',3= '2',4= '3',5= '4',6= '5');
$lengths_array = array(1= '0',2= '1',3= '2',4= '3',5= '4',6= '5',7= '6');
$micronaire_array = array(1= '0',2= '1',3= '2',4= '3',5= '4');
if(isset($year)&&($year!=0)) $where .= " AND year=".$year_array[$year];
if(isset($ctype)&&($ctype!=0)) $where .= " AND ctype=".$ctype_array[$ctype];
if(isset($colors)&&($colors!=0)) $where .= " AND colors=".$colors_array[$colors];
if(isset($lengths)&&($lengths!=0)) $where .= " AND lengths=".$lengths_array[$lengths];
if(isset($micronaire)&&($micronaire!=0)) $where .= " AND micronaire=".$micronaire_array[$micronaire];
/**
*加入搜索条件
*/
?