get_headers.php

来自「PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。」· PHP 代码 · 共 77 行

<?php
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Aidan Lister <[e-mail]>                                |
// +----------------------------------------------------------------------+
//
// $Id: get_headers.php 3486 2005-07-29 12:10:48Z nbm $


/**
 * Replace get_headers()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/function.get_headers
 * @author      Aeontech <[e-mail]>
 * @author      Cpurruc <[e-mail]>
 * @author      Aidan Lister <[e-mail]>
 * @version     $Revision: 3486 $
 * @since       PHP 5.0.0
 * @require     PHP 4.0.0 (user_error)
 */
if (!function_exists('get_headers')) {
    function get_headers($url, $format = 0)
    {
        // Init
        $urlinfo = parse_url($url);
        $port    = isset($urlinfo['port']) ? $urlinfo['port'] : 80;

        // Connect
        $fp = fsockopen($urlinfo['host'], $port, $errno, $errstr, 30);
        if ($fp === false) {
            return false;
        }
              
        // Send request
        $head = 'HEAD ' . $urlinfo['path'] .
            (isset($urlinfo['query']) ? '?' . $urlinfo['query'] : '') .
            ' HTTP/1.0' . "\r\n" .
            'Host: ' . $urlinfo['host'] . "\r\n\r\n";
        fputs($fp, $head);

        // Read
        while (!feof($fp)) {
            if ($header = trim(fgets($fp, 1024))) {
                list($key) = explode(':', $header);

                if ($format === 1) {
                    // First element is the HTTP header type, such as HTTP 200 OK
                    // It doesn't have a separate name, so check for it
                    if ($key == $header) {
                        $headers[] = $header;
                    } else {
                        $headers[$key] = substr($header, strlen($key)+2);
                    }
                } else {
                    $headers[] = $header;
                }
            }
        }

        return $headers;
    }
}

?>