php curl批量打开网址(curl_multi类)的实现代码

<?php  
/*
 * curl_multi 经测试,大于四个网址时要比Foreach循环快..
 * by wc1217
 * edit：www.jb200.com
 */ 
class curl_multi{
    //Curl句柄 
    //private $curl_handle = null; 
    //网址 
    private $url_list = array(); 
    //参数 
    private $curl_setopt = array( 
        'CURLOPT_RETURNTRANSFER' => 1, //结果返回给变量 
        'CURLOPT_HEADER' => 0, //要HTTP头不? 
        'CURLOPT_NOBODY' => 0, //不要内容? 
        'CURLOPT_FOLLOWLOCATION' => 0, //自动跟踪 
        'CURLOPT_TIMEOUT' => 6//超时(s) 
    ); 
 
    function __construct($seconds = 30){ 
        set_time_limit($seconds); 
    } 
 
    /*
     * 设置网址
     * @list 数组
     */ 
    public function setUrlList($list = array()){ 
        $this->url_list = $list; 
    } 
 
    /*
     * 设置参数
     * @cutPot array
     */ 
    public function setOpt($cutPot){ 
        $this->curl_setopt = $cutPot + $this->curl_setopt; 
    } 
 
    /*
     * 执行
     * @return array
     */
    public function exec(){ 
        $mh = curl_multi_init(); 
 
        foreach($this->url_list as $i => $url){ 
            $conn[$i] = curl_init($url); 
 
            foreach($this->curl_setopt as $key => $val){ 
                curl_setopt($conn[$i], preg_replace('/(CURLOPT_w{1,})/ie', '$0', $key), $val); 
            } 
            curl_multi_add_handle($mh, $conn[$i]); 
        } 
 
        $active = false; 
 
        do{ 
            $mrc = curl_multi_exec($mh, $active); 
        }while($mrc == CURLM_CALL_MULTI_PERFORM); 
 
        while($active and $mrc == CURLM_OK){ 
            if(curl_multi_select($mh) != -1){ 
                do{ 
                    $mrc = curl_multi_exec($mh, $active); 
                }while($mrc == CURLM_CALL_MULTI_PERFORM); 
            } 
        } 
 
        $res = array(); 
        foreach($this->url_list as $i => $url){ 
            $res[$i] = curl_multi_getcontent($conn[$i]); 
            curl_close($conn[$i]); 
            curl_multi_remove_handle($mh, $conn[$i]);   //用完马上释放资源   
        } 
        curl_multi_close($mh); 
        return $res; 
    }
}
?>