php 查看某个网址是否被百度收录

<?php
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;
}
}

echo checkBaidu('http://outofmemory.cn
?>
//该片段来自于http://outofmemory.cn