php实现httpRequest的方法

<?php 
    /**
    * Respose A Http Request
    *
    * @param string $url
    * @param array $post
    * @param string $method
    * @param bool $returnHeader
    * @param string $cookie
    * @param bool $bysocket
    * @param string $ip
    * @param integer $timeout
    * @param bool $block
    * @return string Response
    */ 
    function httpRequest($url,$post='',$method='GET',$limit=0,$returnHeader=FALSE,$cookie='',$bysocket=FALSE,$ip='',$timeout=15,$block=TRUE) { 
       $return = ''; 
       $matches = parse_url($url); 
       !isset($matches['host']) && $matches['host'] = ''; 
       !isset($matches['path']) && $matches['path'] = ''; 
       !isset($matches['query']) && $matches['query'] = ''; 
       !isset($matches['port']) && $matches['port'] = ''; 
       $host = $matches['host']; 
       $path = $matches['path'] ? $matches['path'].($matches['query'] ? '?'.$matches['query'] : '') : '/'; 
       $port = !empty($matches['port']) ? $matches['port'] : 80; 
       if(strtolower($method) == 'post') { 
           $post = (is_array($post) and !empty($post)) ? http_build_query($post) : $post; 
           $out = "POST $path HTTP/1.0\r\n"; 
           $out .= "Accept: */*\r\n"; 
           //$out .= "Referer: $boardurl\r\n"; 
           $out .= "Accept-Language: zh-cn\r\n"; 
           $out .= "Content-Type: application/x-www-form-urlencoded\r\n"; 
           $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n"; 
           $out .= "Host: $host\r\n"; 
           $out .= 'Content-Length: '.strlen($post)."\r\n"; 
           $out .= "Connection: Close\r\n"; 
           $out .= "Cache-Control: no-cache\r\n"; 
           $out .= "Cookie: $cookie\r\n\r\n"; 
           $out .= $post; 
       } else { 
           $out = "GET $path HTTP/1.0\r\n"; 
           $out .= "Accept: */*\r\n"; 
           //$out .= "Referer: $boardurl\r\n"; 
           $out .= "Accept-Language: zh-cn\r\n"; 
           $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n"; 
           $out .= "Host: $host\r\n"; 
           $out .= "Connection: Close\r\n"; 
           $out .= "Cookie: $cookie\r\n\r\n"; 
       } 
       $fp = fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout); 
       if(!$fp) return ''; else { 
           $header = $content = ''; 
           stream_set_blocking($fp, $block); 
           stream_set_timeout($fp, $timeout); 
           fwrite($fp, $out); 
           $status = stream_get_meta_data($fp); 
           if(!$status['timed_out']) {//未超时 
               while (!feof($fp)) { 
                   $header .= $h = fgets($fp); 
                   if($h && ($h == "\r\n" ||  $h == "\n")) break; 
               } 
 
               $stop = false; 
               while(!feof($fp) && !$stop) { 
                   $data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit)); 
                   $content .= $data; 
                   if($limit) { 
                       $limit -= strlen($data); 
                       $stop = $limit <= 0; 
                   } 
               } 
           } 
        fclose($fp); 
           return $returnHeader ? array($header,$content) : $content; 
       } 
    } 
?>

echo httpRequest('http://www.baidu.com');