<?php
function recordUrlKeywords($url){
	$spider=array('baidu.'=>'百度','google.'=>'谷歌','soso.'=>'搜搜','sogou.'=>'搜狗','www.so.com'=>'360');
	$q=array('百度'=>'/wd=([^&]*)/i','谷歌'=>'/q=([^&]*)/i','360'=>'/q=(.*)/i','搜狗'=>'/query=([^&]*)/i','搜搜'=>'/w=([^&]*)/i');
	//author:www.phpernote.com
	foreach($spider as $k=>$v){
		if(strpos($url,$k)){
			preg_match("{$q[$v]}",$url,$b);
			if($v=='搜搜'||$v=='搜狗'){
				$keywords=iconv('GBK','UTF-8',urldecode($b[1]));
			}else{
				$keywords=urldecode($b[1]);
			}
			echo "来自{$v}的关键字:".$keywords;
		}
	}
}
$url=$_SERVER['HTTP_REFERER'];//获取网站来源地址
recordUrlKeywords($url);