php curl 抓取

<?php

 set_time_limit(0);
function curl_multi($urls) {  
    if (!is_array($urls) or count($urls) == 0) {  
        return false;  
    }   
    $num=count($urls);  
    $curl = $curl2 = $text = array();  
    $handle = curl_multi_init();  
    function createCh($url) {  
        $ch = curl_init();  
        curl_setopt ($ch, CURLOPT_URL, $url);  
        curl_setopt ($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko');//设置头部  
        curl_setopt ($ch, CURLOPT_REFERER, $url); //设置来源  
        curl_setopt ($ch, CURLOPT_ENCODING, "gzip"); // 编码压缩  
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);  
        curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);//是否采集301、302之后的页面  
        curl_setopt ($ch, CURLOPT_MAXREDIRS, 5);//查找次数，防止查找太深  
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); // 对认证证书来源的检查  
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); // 从证书中检查SSL加密算法是否存在         
        curl_setopt ($ch, CURLOPT_TIMEOUT, 20);  
        curl_setopt ($ch, CURLOPT_HEADER, 0);//输出头部  
        return $ch;  
    }  
    foreach($urls as $k=>$v){  
        $url=$urls[$k];  
        $curl[$k] = createCh($url);  
        curl_multi_add_handle ($handle,$curl[$k]);  
    }  
    $active = null;  
    do {  
        $mrc = curl_multi_exec($handle, $active);  
    } while ($mrc == CURLM_CALL_MULTI_PERFORM);  
  
    while ($active && $mrc == CURLM_OK) {  
        if (curl_multi_select($handle) != -1) {  
            usleep(100);  
        }  
        do {  
            $mrc = curl_multi_exec($handle, $active);  
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);  
    }   
  
    foreach ($curl as $k => $v) {  
        if (curl_error($curl[$k]) == "") {  
            $text[$k] = (string) curl_multi_getcontent($curl[$k]);   
        }  
        curl_multi_remove_handle($handle, $curl[$k]);  
        curl_close($curl[$k]);  
    }   
    curl_multi_close($handle);  
    return $text;  
}  
$urls=array('http://www.baidu.com',  
            'http://www.baidu.com',  
            'http://www.baidu.com',  
            'http://www.baidu.com',  
            'http://www.baidu.com',  
            'http://www.baidu.com',  
            'http://www.baidu.com',  
            'http://www.baidu.com'  
            );  
$res=curl_multi($urls);  
print_r($res);