php记录搜索引擎关键词的代码示例

<?php
/**
* 记录搜索引擎搜索关键词
* edit by bbs.it-home.org
*/

//搜索来源
$rfr = $_SERVER['HTTP_REFERER'];  
//if(!$rfr) $rfr='http://'.$_SERVER['HTTP_HOST'];  
if($rfr)  
{  
    $p=parse_url($rfr);  
    parse_str($p['query'],$pa);  
    $p['host']=strtolower($p['host']);  
    $arr_sd_key=array(  
                    'baidu.com'=>'word',  
                    'google.com'=>'q',  
                    'sina.com.cn'=>'word',  
                    'sohu.com'=>'word',  
                    'msn.com'=>'q',  
                    'bing.com'=>'q',  
                    '163.com'=>'q',  
                    'yahoo.com'=>'p'  
                    );  
    $keyword='';  
    $sengine=$p['host'];  
    foreach($arr_sd_key as $se=>$kwd)  
    {  
        if(strpos($p['host'],$se)!==false)  
        {  
            $keyword=$pa[$kwd];  
            $sengine=$se;  
            break;  
        }  
    }
    //写入搜索日志
    $sql="insert into visit_log(domain,key_word,ct)";  
}
?>