PHP功能强大的CURL POST类

<?php 
class Request{
  public static function post($url, $post_data = '', $timeout = 5){//curl

    $ch = curl_init();
 curl_setopt ($ch, CURLOPT_URL, $url);
    curl_setopt ($ch, CURLOPT_POST, 1);
    if($post_data != ''){


      curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);

    }
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); 
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    curl_setopt($ch, CURLOPT_HEADER, false);
 $file_contents = curl_exec($ch);
    curl_close($ch);
    return $file_contents;

  }

  public static function post2($url, $data){//file_get_content
    $postdata = http_build_query(
      $data
    );
    $opts = array('http' =>
           array(
             'method' => 'POST',
             'header' => 'Content-type: application/x-www-form-urlencoded',
             'content' => $postdata
           )

    );

    $context = stream_context_create($opts);
    $result = file_get_contents($url, false, $context);
    return $result;

  }
 public static function post3($host,$path,$query,$others=''){//fsocket

    $post="POST $path HTTP/1.1\r\nHost: $host\r\n";
    $post.="Content-type: application/x-www-form-";
    $post.="urlencoded\r\n${others}";
    $post.="User-Agent: Mozilla 4.0\r\nContent-length: ";
    $post.=strlen($query)."\r\nConnection: close\r\n\r\n$query";
    $h=fsockopen($host,80);
    fwrite($h,$post);
    for($a=0,$r='';!$a;){
        $b=fread($h,8192); 
        $r.=$b;
        $a=(($b=='')?1:0); 

      }
    fclose($h);
    return $r;

  }

}

?>