php获取从百度搜索进入网站的关键词

 <?php 

 function search_word_from() {
 $referer = isset($_SERVER['HTTP_REFERER'])?$_SERVER['HTTP_REFERER']:'';
 if(strstr( $referer, 'baidu.com')){ //百度
 preg_match( "|baidu.+wo?r?d=([^\\&]*)|is", $referer, $tmp );
 $keyword = urldecode( $tmp[1] );
 $from = 'baidu'; （PS：T不错的PHP Q扣峮：276167802，验证：csl）
 }elseif(strstr( $referer, 'google.com') or strstr( $referer, 'google.cn')){ //谷歌
 preg_match( "|google.+q=([^\\&]*)|is", $referer, $tmp );
 $keyword = urldecode( $tmp[1] );
 $from = 'google'; www.jbxue.com
 }elseif(strstr( $referer, 'so.com')){ //360搜索
 preg_match( "|so.+q=([^\\&]*)|is", $referer, $tmp );
 $keyword = urldecode( $tmp[1] );
 $from = '360';
 }elseif(strstr( $referer, 'sogou.com')){ //搜狗
 preg_match( "|sogou.com.+query=([^\\&]*)|is", $referer, $tmp );
 $keyword = urldecode( $tmp[1] );
 $from = 'sogou';
 }elseif(strstr( $referer, 'soso.com')){ //搜搜
 preg_match( "|soso.com.+w=([^\\&]*)|is", $referer, $tmp );
 $keyword = urldecode( $tmp[1] );
 $from = 'soso';
 }else {
 $keyword ='';
 $from = '';
 }

 return array('keyword'=>$keyword,'from'=>$from);
 }

 //以下为测试
 //在搜索引擎搜索个关键词，进入网站
 $word = search_word_from();
 if(!empty($word['keyword'])){
 echo '关键字：'.$word['keyword'].' 来自：'.$word['from'];
 }
 ?>