php获取从百度搜索进入网站的关键词

php代码

<?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';
	}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';
	}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'];
}
?>