php结合curl实现多线程抓取

$url){ $conn[$k]=curl_init($url);

curl_setopt($conn[$k],CURLOPT_TIMEOUT,$timeout);//设置超时时间
curl_setopt($conn[$k],CURLOPT_USERAGENT,'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
curl_setopt($conn[$k],CURLOPT_MAXREDIRS,7);//HTTp定向级别
curl_setopt($conn[$k],CURLOPT_HEADER,0);//这里不要header，加块效率
curl_setopt($conn[$k],CURLOPT_FOLLOWLOCATION,1); // 302 redirect
curl_setopt($conn[$k],CURLOPT_RETURNTRANSFER,1);
curl_multi_add_handle ($mh,$conn[$k]);

}
//防止死循环耗死cpu 这段是根据网上的写法
do {
$mrc = curl_multi_exec($mh,$active);//当无数据，active=true
} while ($mrc == CURLM_CALL_MULTI_PERFORM);//当正在接受数据时
while ($active and $mrc == CURLM_OK) {//当无数据时或请求暂停时，active=true
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh,$active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}

foreach ($array as $k => $url) {
curl_error($conn[$k]);
$res[$k]=curl_multi_getcontent($conn[$k]);//获得返回信息
$header[$k]=curl_getinfo($conn[$k]);//返回头信息
curl_close($conn[$k]);//关闭语柄
curl_multi_remove_handle($mh,$conn[$k]); //释放资源
}

curl_multi_close($mh);
$endtime = getmicrotime();
$diff_time = $endtime - $startime;

return array('diff_time'=>$diff_time,'return'=>$res,'header'=>$header
);

}
//计算当前时间
function getmicrotime() {
list($usec,$sec) = explode(" ",microtime());
return ((float)$usec + (float)$sec);
}

//测试一下，curl 三个网址
$array = array(
"http://www.weibo.com/","http://www.renren.com/","http://www.qq.com/"
);
$data = Curl_http($array,'10');//调用
var_dump($data);//输出
//如果POST的数据大于1024字节，curl并不会直接就发起POST请求
//发送请求时，header中包含一个空的Expect。curl_setopt($ch,CURLOPT_HTTPHEADER,array("Expect:"));
?>

$url) { $conn[$i] = curl_init($url); curl_setopt($conn[$i],"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"); curl_setopt($conn[$i],0); curl_setopt($conn[$i],CURLOPT_CONNECTTIMEOUT,60); curl_setopt($conn[$i],CURLOPT_FILE,$st); // 将爬取的代码写入文件 curl_multi_add_handle ($mh,$conn[$i]); } // 初始化 do { curl_multi_exec($mh,$active); } while ($active); // 执行 foreach ($urls as $i => $url) { curl_multi_remove_handle($mh,$conn[$i]); curl_close($conn[$i]); } // 结束清理 curl_multi_close($mh); fclose($st);

$url) { $data = curl_multi_getcontent($conn[$i]); // 获得爬取的代码字符串 fwrite($st,$data); // 将字符串写入文件 } // 获得数据变量，并写入文件 foreach ($urls as $i => $url) { curl_multi_remove_handle($mh,$conn[$i]); curl_close($conn[$i]); } curl_multi_close($mh); fclose($st);

$url){ $g=$save_to.basename($url); if(!is_file($g)){ $conn[$i]=curl_init($url); $fp[$i]=fopen($g,"w"); curl_setopt($conn[$i],"Mozilla/4.0(compatible; MSIE 7.0; Windows NT 6.0)"); curl_setopt($conn[$i],$fp[$i]); curl_setopt($conn[$i],0); curl_setopt($conn[$i],60); curl_multi_add_handle($mh,$conn[$i]); } } do{ $n=curl_multi_exec($mh,$active); }while($active); foreach($urls as $i=>$url){ curl_multi_remove_handle($mh,$conn[$i]); curl_close($conn[$i]); fclose($fp[$i]); } curl_multi_close($mh);$urls=array( '//www.52php.cn/5w.zip',$conn[$i]); curl_close($conn[$i]); fclose($fp[$i]); } curl_multi_close($mh);