使用方法：

$urls = array("http://baidu.com", "http://bestlovesky.com", "http://google.com");$mp = new MultiHttpRequest($urls);$mp ->start();

/** * Curl 多线程类 * 使用方法： * ======================== * $urls = array("http://baidu.com", "http://bestlovesky.com", "http://google.com"); * $mp = new MultiHttpRequest($urls); * $mp->start(); * ======================== */class MultiHttpRequest{    public $urls = array();    public $curlopt_header = 1;    public $method = "GET";    function __construct($urls = false)    {        $this -> urls = $urls;    }     function set_urls($urls)    {        $this -> urls = $urls;        return $this;    }     function is_return_header($b)    {        $this -> curlopt_header = $b;        return $this;    }     function set_method($m)    {        $this -> medthod = strtoupper($m);        return $this;    }     function start()    {        if (!is_array($this -> urls) or count($this -> urls) == 0)        {            return false;        }         $curl = $text = array();        $handle = curl_multi_init();        foreach($this -> urls as $k => $v)        {            $curl[$k] = $this -> add_handle($handle, $v);        }         $this -> exec_handle($handle);        foreach($this -> urls as $k => $v)        {            curl_multi_getcontent($curl[$k]);            echo $curl[$k] . "\n";             // $text[$k] =  curl_multi_getcontent($curl[$k]);            // echo $text[$k], "\n\n";            curl_multi_remove_handle($handle, $curl[$k]);        }         curl_multi_close($handle);    }     private function add_handle($handle, $url)    {        $curl = curl_init();        curl_setopt($curl, CURLOPT_URL, $url);        curl_setopt($curl, CURLOPT_HEADER, $this -> curlopt_header);        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);        curl_multi_add_handle($handle, $curl);        return $curl;    }     private function exec_handle($handle)    {        $flag = null;        do        {            curl_multi_exec($handle, $flag);        }         while ($flag > 0);    } }

分享一个php多线程类（其实是php利用curl实现的一个多线程类），有了这个类，我们也可利用该类执行多线程任务了

     1,//结果返回给变量        'CURLOPT_HEADER' => 0,//是否需要返回HTTP头        'CURLOPT_NOBODY' => 0,//是否需要返回的内容        'CURLOPT_FOLLOWLOCATION' => 0,//自动跟踪        'CURLOPT_TIMEOUT' => 6//超时时间(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 execute(){        $mh=curl_multi_init();        foreach($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[$i]);//释放资源          }        curl_multi_close($mh);        return $res;    }}

$curl_mul=new curl_multi();$curl_mul->setUrlList(array('http://www.baidu.com/img/baidu_sylogo1.gif','http://www.baidu.com/img/baidu_sylogo1.gif','http://www.baidu.com/img/baidu_sylogo1.gif'));$a=$curl_mul->execute();$i=1;foreach($a as $v){	$filename=$i.'.gif';    $fp2=@fopen($filename,'a');    fwrite($fp2,$v);    fclose($fp2);	$i++;}