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113 lines
3.9 KiB
PHP
113 lines
3.9 KiB
PHP
<?php
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//
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// +----------------------------------------------------------------------+
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// | PHP version 4.0 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2001 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.02 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available at through the world-wide-web at |
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// | http://www.php.net/license/2_02.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Authors: Stig Bakken <ssb@fast.no> |
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// | |
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// +----------------------------------------------------------------------+
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//
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// $Id$
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//
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// HTTP utility functions.
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//
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if (!empty($GLOBALS['USED_PACKAGES']['HTTP'])) return;
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$GLOBALS['USED_PACKAGES']['HTTP'] = true;
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class HTTP {
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/**
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* Format a date according to RFC-XXXX (can't remember the HTTP
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* RFC number off-hand anymore, shame on me). This function
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* honors the "y2k_compliance" php.ini directive.
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*
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* @param $time int UNIX timestamp
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*
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* @return HTTP date string, or false for an invalid timestamp.
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*
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* @author Stig Bakken <ssb@fast.no>
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*/
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function Date($time) {
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$y = ini_get("y2k_compliance") ? "Y" : "y";
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return gmdate("D, d M $y H:i:s", $time);
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}
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/**
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* Negotiate language with the user's browser through the
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* Accept-Language HTTP header or the user's host address.
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* Language codes are generally in the form "ll" for a language
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* spoken in only one country, or "ll_CC" for a language spoken in
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* a particular country. For example, U.S. English is "en_US",
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* while British English is "en_UK". Portugese as spoken in
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* Portugal is "pt_PT", while Brazilian Portugese is "pt_BR".
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* Two-letter country codes can be found in the ISO 3166 standard.
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*
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* Quantities in the Accept-Language: header are supported, for
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* example:
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*
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* Accept-Language: en_UK;q=0.7, en_US;q=0.6, no;q=1.0, dk;q=0.8
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*
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* @param $supported an associative array indexed by language
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* codes (country codes) supported by the application. Values
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* must evaluate to true.
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*
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* @param $default the default language to use if none is found
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* during negotiation, defaults to "en_US" for U.S. English
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*
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* @author Stig Bakken <ssb@fast.no>
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*/
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function negotiateLanguage(&$supported, $default = 'en_US') {
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global $HTTP_SERVER_VARS;
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/* If the client has sent an Accept-Language: header, see if
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* it contains a language we support.
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*/
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if (isset($HTTP_SERVER_VARS['HTTP_ACCEPT_LANGUAGE'])) {
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$accepted = split(',[[:space:]]*', $HTTP_ACCEPT_LANGUAGE);
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for ($i = 0; $i < count($accepted); $i++) {
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if (eregi('^([a-z]+);[[:space:]]*q=([0-9\.]+)', $accepted[$i], &$arr)) {
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$q = (double)$arr[2];
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$l = $arr[1];
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} else {
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$q = 42;
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$l = $accepted[$i];
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}
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if (!empty($supported[$l]) && ($q > 0.0)) {
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if ($q == 42) {
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return $l;
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}
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$candidates[$l] = $q;
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}
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}
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if (isset($candidates)) {
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arsort($candidates);
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reset($candidates);
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return key($candidates);
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}
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}
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/* Check for a valid language code in the top-level domain of
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* the client's host address.
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*/
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if (ereg("\.[^\.]+$", $HTTP_SERVER_VARS['REMOTE_HOST'], &$arr)) {
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$lang = strtolower($arr[1]);
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if (!empty($supported[$lang])) {
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return $lang;
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}
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}
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return $default;
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}
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}
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?>
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