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');