<?php
/**
* 分析搜索引擎到来的关键字
*
*
* @author zhangjun
* @charset utf-8
*/
class searchTerms {
public static $banUrl = array('qq.com','localhost'); //不解析的referer 有利于加快程序处理速度
public static $parseHost = array('baidu','google','360','soso'); //能解析的referer
/**
* 主方法
* @return boolean || array
*/
public static function keyword(){
if(!isset($_SERVER['HTTP_REFERER']))
return false;
$referer = trim($_SERVER['HTTP_REFERER']);
$refererArr = parse_url($referer);
//判断refer是否来至不需要分析的地址。
if(self::inBanUrl($refererArr['host']))
return false;
$hasParseFun = false;
foreach(self::$parseHost as $host) {
if(strpos ($refererArr['host'],$host) !== false) {
$hasParseFun = true;
break;
}
}
if(!$hasParseFun)
return false;
$queryVars = array();
parse_str($refererArr['query'], $queryVars);
//调用每个搜索引擎的单独处理方法
$method = 'parse'.ucfirst($host);
return self::$method($queryVars);
}
/* 已取消使用正则的方式。
public static function buldPattern($rule) {
$host = str_replace('.', '.', $rule['host']);
$patterns = array();
foreach ($rule['key'] as $key) {
$patterns[] = $host . '.+?'.$key.'=';
}
return "/(?:" . implode('|', $patterns).')([^&]*)/';
}*/
public static function inBanUrl($referer) {
foreach(self::$banUrl as $url) {
if(strpos($url, $referer) !== false)
return true;
}
return false;
}
public static function parseBaidu($params)
{
$searchTerms = '';
if(isset($params['kw'])) {
$searchTerms = $params['kw'];
} else if(isset ($params['wd'])) {
$searchTerms = $params['wd'];
} else if(isset ($params['word'])) {
$searchTerms = $params['word'];
}
return isset($params['ie']) && (strtolower($params['ie']) == 'utf-8') ? $searchTerms : iconv('gbk', 'utf-8', $searchTerms);
}
public static function parseGoogle($params)
{
$searchTerms = '';
if(isset($params['q'])) {
$searchTerms = $params['q'];
}
return isset($params['ie']) && ($params['ie'] == "GB") ? iconv('gbk', 'utf-8', $searchTerms) : $params['q'];
}
public static function parse360($params)
{
$searchTerms = '';
if(isset($params['q'])) {
$searchTerms = $params['q'];
}
return $searchTerms;
}
public static function parseSoso($params)
{
$searchTerms = '';
if(isset($params['w'])) {
$searchTerms = $params['w'];
}
return iconv('gbk', 'utf-8', $searchTerms);
}
}
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