php curl检测网页是否被百度收录

<?php
/*
* 检测百度是否收录网页 curl模式
* @ param string $url传入的url
* return int (1 收录 0 不收录)
*/
function checkBaidu($url){
$url='http://www.baidu.com/s?wd='.$url;
$curl=curl_init();
curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
$rs=curl_exec($curl);
curl_close($curl);
$arr=parse_url($url);
if(strpos($arr['query'],'http://')){
$arr['query']=str_replace('http://','',str_replace('wd=','',$arr['query']));
}else{
$arr['query']=str_replace('wd=','',$arr['query']);
}
if(strpos($arr['query'],'?')){
$str=strstr($arr['query'],'?');
$arr['query']=str_replace($str,'',$arr['query']);
}
if(strpos($arr['query'],'/')){
$narr=explode('/',$arr['query']);
$arr['query']=$narr[0];
}
if(strpos($rs,'<b>'.$arr['query'].'</b>')){
return 1;
}else{
return 0;
}
}

//调用示例，检测是否百度收录
echo checkBaidu('http://www.jb200.com/');
?>