/**
 * http请求处理类（基于CURL进行封装）
 * 
 * @author 绝缘体
 * @version        $Id$
 */
class cls_http_request
{
    
    /**
     * get方式请求（curl）
     *
     * @param string  $url        请求的url
     * @param integer $timeout    超时时间（s）
     * @return string(请求成功) | false(请求失败)
     */
    public static function curl_get($url, $timeout = 1)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        $result = curl_exec($ch);
        curl_close($ch);
        if (is_string($result) && strlen($result))
        {
            return $result;
        }
        else
        {
            return false;
        }
    }
    
    /**
     * post方式请求
     *
     * @param string $url        请求的url
     * @param array $data        请求的参数数组（关联数组）
     * @param integer $timeout    超时时间（s）
     * @return string(请求成功) | false(请求失败)
     */
    public static function curl_post($url, $data, $timeout = 2)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        $result = curl_exec($ch);
        curl_close($ch);
        if (is_string($result) && strlen($result))
        {
            return $result;
        }
        else
        {
            return false;
        }
    }
    
    /**
     * 多个url并行请求
     *
     * @param array $urls    url数组
     * @param integer $timeout    超时时间(s)
     * @return array $res    返回结果
     */
    public static function curl_get_urls($urls, $timeout = 1)
    {
        $mh=curl_multi_init();
        $chs=array();
        foreach($urls as $url)
        {
            $ch=curl_init();
            curl_setopt($ch,CURLOPT_URL,$url);
            curl_setopt($ch,CURLOPT_HEADER,false);
            curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
            curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,1);
            curl_setopt($ch,CURLOPT_TIMEOUT,$timeout);
            curl_multi_add_handle($mh,$ch);
            $chs[]=$ch;
        }
        $active=null;
        do {
            $mrc=curl_multi_exec($mh,$active);
        }while($mrc == CURLM_CALL_MULTI_PERFORM);
        while($active && $mrc == CURLM_OK)
        {
            if(curl_multi_select($mh) != -1)
            {
                do{
                    $mrc=curl_multi_exec($mh,$active);
                }while($mrc == CURLM_CALL_MULTI_PERFORM);
            }
        }
        $res=array();
        foreach($chs as $ch)
        {
            $res[]=curl_multi_getcontent($ch);
            curl_multi_remove_handle($mh,$ch);
        }
        curl_multi_close($mh);
        return $res;
    }
}

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