fsockopen get,post 封装 （转）

function http_request($url, $method = ‘GET‘, $postfields = NULL, $headers = array()) {
 
    $parse = parse_url($url);
 
    isset($parse[‘host‘]) ||$parse[‘host‘] = ‘‘;
    isset($parse[‘path‘]) || $parse[‘path‘] = ‘‘;
    isset($parse[‘query‘]) || $parse[‘query‘] = ‘‘;
    isset($parse[‘port‘]) || $parse[‘port‘] = ‘‘;
 
    $path = $parse[‘path‘] ? $parse[‘path‘].($parse[‘query‘] ? ‘?‘.$parse[‘query‘] : ‘‘) : ‘/‘;
    $host = $parse[‘host‘];
 
    //协议
    if ($parse[‘scheme‘] == ‘https‘) {
        $version = ‘1.1‘;
        $port = empty($parse[‘port‘]) ? 443 : $parse[‘port‘];
        $host = ‘ssl://‘.$host;
    } else {
        $version = ‘1.0‘;
        $port = empty($parse[‘port‘]) ? 80 : $parse[‘port‘];
    }
 
    //Headers
    $headers[] = "Host: {$parse[‘host‘]}";
    $headers[] = ‘Connection: Close‘;
    $headers[] = "User-Agent: $_SERVER[HTTP_USER_AGENT]";  
    $headers[] = ‘Accept: */*‘;
 
    //包体信息
    if ($method == ‘POST‘) {
        if(is_array($postfields)){
            $postfields = http_build_query($postfields);
        }
        $headers[] = "Content-type: application/x-www-form-urlencoded";
        $headers[] = ‘Content-Length: ‘.strlen($postfields);
        $out = "POST $path HTTP/$version\r\n".join("\r\n", $headers)."\r\n\r\n".$postfields;
    } else {
        $out = "GET $path HTTP/$version\r\n".join("\r\n", $headers)."\r\n\r\n";
    }
 
    //发送请求
    $limit = 0;
    $fp = fsockopen($host, $port, $errno, $errstr, 30);
 
    if (!$fp) {
        exit(‘Failed to establish socket connection: ‘.$url);
    } else {
        $header = $content = ‘‘;
        //集阻塞/非阻塞模式流,$block==true则应用流模式
        stream_set_blocking($fp, true);
         //设置流的超时时间
        stream_set_timeout($fp, 30);
        fwrite($fp, $out);
        //从封装协议文件指针中取得报头／元数据
        $status = stream_get_meta_data($fp);
 
        if (!$status[‘timed_out‘]) { //未超时
            while (!feof($fp)) {
                $header .= $h = fgets($fp);
                if ($h && ($h == "\r\n" ||  $h == "\n")) break;
                if (strpos($h, ‘Content-Length:‘) !== false) {
                    $limit = intval(substr($header, 15));
                }
            }
 
            $stop = false;
            while (!feof($fp) && !$stop) {
                $data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit));
                $content .= $data;
                if ($limit) {
                    $limit -= strlen($data);
                    $stop = $limit <= 0;
                }
            }
        }
        fclose($fp);
 
        //unchunk
        $content = preg_replace_callback(
            ‘/(?:(?:\r\n|\n)|^)([0-9A-F]+)(?:\r\n|\n){1,2}(.*?)‘.
            ‘((?:\r\n|\n)(?:[0-9A-F]+(?:\r\n|\n))|$)/si‘,
            create_function(
                ‘$matches‘,
                ‘return hexdec($matches[1]) == strlen($matches[2]) ? $matches[2] : $matches[0];‘
            ),
            $content
        );
 
        return $content;
    }
}