PHP获取搜索引擎关键字来源（百度、谷歌、雅虎、搜狗、搜搜、必应、有道）

<?php //获取来自搜索引擎入站时的关键词
function get_keyword($url,$kw_start) { $start=stripos($url,$kw_start); $url=substr($url,$start+strlen($kw_start)); $start=stripos($url,'&'); if ($start>0) { $start=stripos($url,'&'); $s_s_keyword=substr($url,0,$start); } else { $s_s_keyword=substr($url,0); } return $s_s_keyword; } $url=isset($_SERVER['HTTP_REFERER'])?$_SERVER['HTTP_REFERER']:'';//获取入站url。
 $search_1="google.com"; //q= utf8
 $search_2="baidu.com"; //wd= gbk
 $search_3="yahoo.cn"; //q= utf8
 $search_4="sogou.com"; //query= gbk
 $search_5="soso.com"; //w= gbk
 $search_6="bing.com"; //q= utf8
 $search_7="youdao.com"; //q= utf8
 
 $google=preg_match("/\b{$search_1}\b/",$url);//记录匹配状况，用于入站判断。
 $baidu=preg_match("/\b{$search_2}\b/",$url); $yahoo=preg_match("/\b{$search_3}\b/",$url); $sogou=preg_match("/\b{$search_4}\b/",$url); $soso=preg_match("/\b{$search_5}\b/",$url); $bing=preg_match("/\b{$search_6}\b/",$url); $youdao=preg_match("/\b{$search_7}\b/",$url); $s_s_keyword=""; $bul=$_SERVER['HTTP_REFERER']; //获取没参数域名
 preg_match('@^(?:http://)?([^/]+)@i',$bul,$matches); $burl=$matches[1]; //匹配域名设置
 $curl="www.netxu.com"; if($burl!=$curl){ if ($google) {//来自google
   $s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。
   $s_s_keyword=urldecode($s_s_keyword); $urlname="谷歌："; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; //$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk
 } else if($baidu) {//来自百度
   $s_s_keyword=get_keyword($url,'wd=');//关键词前的字符为"wd="。
   $s_s_keyword=urldecode($s_s_keyword); $s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk
   $urlname="百度："; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; } else if($yahoo) {//来自雅虎
   $s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。
   $s_s_keyword=urldecode($s_s_keyword); //$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk
   $urlname="雅虎："; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; } else if($sogou) {//来自搜狗
   $s_s_keyword=get_keyword($url,'query=');//关键词前的字符为"query="。
   $s_s_keyword=urldecode($s_s_keyword); $s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk
   $urlname="搜狗："; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; } else if($soso) {//来自搜搜
   $s_s_keyword=get_keyword($url,'w=');//关键词前的字符为"w="。
   $s_s_keyword=urldecode($s_s_keyword); $s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk
   $urlname="搜搜："; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; } else if($bing) {//来自必应
   $s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。
   $s_s_keyword=urldecode($s_s_keyword); //$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk
   $urlname="必应："; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; } else if($youdao) {//来自有道
   $s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。
   $s_s_keyword=urldecode($s_s_keyword); //$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk
   $urlname="有道："; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; } else{ $urlname=$burl; $s_s_keyword=""; $_SESSION["urlname"]=$urlname; $_SESSION["s_s_keyword"]=$s_s_keyword; } $s_urlname=$urlname; $s_urlkey=$s_s_keyword; } else{ $s_urlname=$_SESSION["urlname"]; $s_urlkey=$_SESSION["s_s_keyword"]; } ?>