360 lines
12 KiB
PHP
360 lines
12 KiB
PHP
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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* HTTP
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*
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* PHP versions 4 and 5
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*
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* @category HTTP
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* @package HTTP
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* @author Stig Bakken <ssb@fast.no>
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* @author Sterling Hughes <sterling@php.net>
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* @author Tomas V.V.Cox <cox@idecnet.com>
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* @author Richard Heyes <richard@php.net>
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* @author Philippe Jausions <Philippe.Jausions@11abacus.com>
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* @author Michael Wallner <mike@php.net>
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* @copyright 2002-2005 The Authors
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* @license BSD, revised
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* @version CVS: $Id: HTTP.php,v 1.48 2005/11/08 20:11:54 mike Exp $
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* @link http://pear.php.net/package/HTTP
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*/
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/**
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* Miscellaneous HTTP Utilities
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*
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* PEAR::HTTP provides static shorthand methods for generating HTTP dates,
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* issueing HTTP HEAD requests, building absolute URIs, firing redirects and
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* negotiating user preferred language.
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*
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* @package HTTP
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* @category HTTP
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* @access public
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* @static
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* @version $Revision: 1.48 $
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*/
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class HTTP
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{
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/**
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* Date
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*
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* Format a RFC compliant GMT date HTTP header. This function honors the
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* "y2k_compliance" php.ini directive and formats the GMT date corresponding
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* to either RFC850 or RFC822.
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*
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* @static
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* @access public
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* @return mixed GMT date string, or false for an invalid $time parameter
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* @param mixed $time unix timestamp or date (default = current time)
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*/
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static function Date($time = null)
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{
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if (!isset($time)) {
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$time = time();
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} elseif (!is_numeric($time) && (-1 === $time = strtotime($time))) {
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return false;
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}
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// RFC822 or RFC850
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$format = ini_get('y2k_compliance') ? 'D, d M Y' : 'l, d-M-y';
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return gmdate($format .' H:i:s \G\M\T', $time);
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}
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/**
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* Negotiate Language
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*
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* Negotiate language with the user's browser through the Accept-Language
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* HTTP header or the user's host address. Language codes are generally in
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* the form "ll" for a language spoken in only one country, or "ll-CC" for a
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* language spoken in a particular country. For example, U.S. English is
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* "en-US", 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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*
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* Quality factors in the Accept-Language: header are supported, e.g.:
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* Accept-Language: en-UK;q=0.7, en-US;q=0.6, no, dk;q=0.8
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*
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* <code>
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* require_once 'HTTP.php';
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* $langs = array(
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* 'en' => 'locales/en',
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* 'en-US'=> 'locales/en',
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* 'en-UK'=> 'locales/en',
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* 'de' => 'locales/de',
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* 'de-DE'=> 'locales/de',
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* 'de-AT'=> 'locales/de',
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* );
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* $neg = HTTP::negotiateLanguage($langs);
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* $dir = $langs[$neg];
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* </code>
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*
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* @static
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* @access public
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* @return string The negotiated language result or the supplied default.
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* @param array $supported An associative array of supported languages,
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* whose values must evaluate to true.
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* @param string $default The default language to use if none is found.
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*/
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function negotiateLanguage($supported, $default = 'en-US')
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{
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$supp = array();
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foreach ($supported as $lang => $isSupported) {
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if ($isSupported) {
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$supp[strToLower($lang)] = $lang;
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}
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}
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if (!count($supp)) {
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return $default;
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}
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$matches = array();
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if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
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foreach (explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']) as $lang) {
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$lang = array_map('trim', explode(';', $lang));
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if (isset($lang[1])) {
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$l = strtolower($lang[0]);
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$q = (float) str_replace('q=', '', $lang[1]);
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} else {
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$l = strtolower($lang[0]);
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$q = null;
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}
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if (isset($supp[$l])) {
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$matches[$l] = isset($q) ? $q : 1000 - count($matches);
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}
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}
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}
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if (count($matches)) {
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asort($matches, SORT_NUMERIC);
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return $supp[end($l = array_keys($matches))];
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}
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if (isset($_SERVER['REMOTE_HOST'])) {
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$lang = strtolower(end($h = explode('.', $_SERVER['REMOTE_HOST'])));
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if (isset($supp[$lang])) {
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return $supp[$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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* Head
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*
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* Sends a "HEAD" HTTP command to a server and returns the headers
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* as an associative array. Example output could be:
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* <code>
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* Array
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* (
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* [response_code] => 200 // The HTTP response code
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* [response] => HTTP/1.1 200 OK // The full HTTP response string
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* [Date] => Fri, 11 Jan 2002 01:41:44 GMT
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* [Server] => Apache/1.3.20 (Unix) PHP/4.1.1
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* [X-Powered-By] => PHP/4.1.1
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* [Connection] => close
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* [Content-Type] => text/html
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* )
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* </code>
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*
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* @see HTTP_Client::head()
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* @see HTTP_Request
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*
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* @static
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* @access public
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* @return mixed Returns associative array of response headers on success
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* or PEAR error on failure.
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* @param string $url A valid URL, e.g.: http://pear.php.net/credits.php
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* @param integer $timeout Timeout in seconds (default = 10)
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*/
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function head($url, $timeout = 10)
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{
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$p = parse_url($url);
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if (!isset($p['scheme'])) {
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$p = parse_url(HTTP::absoluteURI($url));
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} elseif ($p['scheme'] != 'http') {
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return HTTP::raiseError('Unsupported protocol: '. $p['scheme']);
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}
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$port = isset($p['port']) ? $p['port'] : 80;
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if (!$fp = @fsockopen($p['host'], $port, $eno, $estr, $timeout)) {
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return HTTP::raiseError("Connection error: $estr ($eno)");
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}
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$path = !empty($p['path']) ? $p['path'] : '/';
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$path .= !empty($p['query']) ? '?' . $p['query'] : '';
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fputs($fp, "HEAD $path HTTP/1.0\r\n");
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fputs($fp, 'Host: ' . $p['host'] . ':' . $port . "\r\n");
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fputs($fp, "Connection: close\r\n\r\n");
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$response = rtrim(fgets($fp, 4096));
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if (preg_match("|^HTTP/[^\s]*\s(.*?)\s|", $response, $status)) {
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$headers['response_code'] = $status[1];
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}
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$headers['response'] = $response;
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while ($line = fgets($fp, 4096)) {
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if (!trim($line)) {
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break;
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}
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if (($pos = strpos($line, ':')) !== false) {
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$header = substr($line, 0, $pos);
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$value = trim(substr($line, $pos + 1));
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$headers[$header] = $value;
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}
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}
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fclose($fp);
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return $headers;
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}
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/**
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* Redirect
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*
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* This function redirects the client. This is done by issuing
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* a "Location" header and exiting if wanted. If you set $rfc2616 to true
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* HTTP will output a hypertext note with the location of the redirect.
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*
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* @static
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* @access public
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* @return mixed Returns true on succes (or exits) or false if headers
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* have already been sent.
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* @param string $url URL where the redirect should go to.
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* @param bool $exit Whether to exit immediately after redirection.
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* @param bool $rfc2616 Wheter to output a hypertext note where we're
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* redirecting to (Redirecting to <a href="...">...</a>.)
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*/
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function redirect($url, $exit = true, $rfc2616 = false)
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{
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if (headers_sent()) {
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return false;
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}
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$url = HTTP::absoluteURI($url);
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header('Location: '. $url);
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if ( $rfc2616 && isset($_SERVER['REQUEST_METHOD']) &&
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$_SERVER['REQUEST_METHOD'] != 'HEAD') {
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printf('Redirecting to: <a href="%s">%s</a>.', $url, $url);
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}
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if ($exit) {
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exit;
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}
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return true;
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}
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/**
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* Absolute URI
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*
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* This function returns the absolute URI for the partial URL passed.
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* The current scheme (HTTP/HTTPS), host server, port, current script
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* location are used if necessary to resolve any relative URLs.
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*
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* Offsets potentially created by PATH_INFO are taken care of to resolve
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* relative URLs to the current script.
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*
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* You can choose a new protocol while resolving the URI. This is
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* particularly useful when redirecting a web browser using relative URIs
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* and to switch from HTTP to HTTPS, or vice-versa, at the same time.
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*
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* @author Philippe Jausions <Philippe.Jausions@11abacus.com>
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* @static
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* @access public
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* @return string The absolute URI.
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* @param string $url Absolute or relative URI the redirect should go to.
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* @param string $protocol Protocol to use when redirecting URIs.
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* @param integer $port A new port number.
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*/
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static function absoluteURI($url = null, $protocol = null, $port = null)
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{
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// filter CR/LF
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$url = str_replace(array("\r", "\n"), ' ', $url);
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// Mess around with already absolute URIs
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if (preg_match('!^([a-z0-9]+)://!i', $url)) {
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if (empty($protocol) && empty($port)) {
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return $url;
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}
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if (!empty($protocol)) {
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$url = $protocol .':'. end($array = explode(':', $url, 2));
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}
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if (!empty($port)) {
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$url = preg_replace('!^(([a-z0-9]+)://[^/:]+)(:[\d]+)?!i',
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'\1:'. $port, $url);
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}
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return $url;
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}
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$host = 'localhost';
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if (!empty($_SERVER['HTTP_HOST'])) {
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list($host) = explode(':', $_SERVER['HTTP_HOST']);
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} elseif (!empty($_SERVER['SERVER_NAME'])) {
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list($host) = explode(':', $_SERVER['SERVER_NAME']);
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}
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if (empty($protocol)) {
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if (isset($_SERVER['HTTPS']) && !strcasecmp($_SERVER['HTTPS'], 'on')) {
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$protocol = 'https';
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} else {
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$protocol = 'http';
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}
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if (!isset($port) || $port != intval($port)) {
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$port = isset($_SERVER['SERVER_PORT']) ? $_SERVER['SERVER_PORT'] : 80;
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}
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}
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if ($protocol == 'http' && $port == 80) {
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unset($port);
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}
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if ($protocol == 'https' && $port == 443) {
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unset($port);
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}
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$server = $protocol .'://'. $host . (isset($port) ? ':'. $port : '');
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if (!strlen($url)) {
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$url = isset($_SERVER['REQUEST_URI']) ?
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$_SERVER['REQUEST_URI'] : $_SERVER['PHP_SELF'];
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}
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if ($url[0] == '/') {
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return $server . $url;
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}
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// Check for PATH_INFO
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if (isset($_SERVER['PATH_INFO']) && strlen($_SERVER['PATH_INFO']) &&
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$_SERVER['PHP_SELF'] != $_SERVER['PATH_INFO']) {
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$path = dirname(substr($_SERVER['PHP_SELF'], 0, -strlen($_SERVER['PATH_INFO'])));
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} else {
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$path = dirname($_SERVER['PHP_SELF']);
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}
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if (substr($path = strtr($path, '\\', '/'), -1) != '/') {
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$path .= '/';
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}
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return $server . $path . $url;
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}
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/**
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* Raise Error
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*
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* Lazy raising of PEAR_Errors.
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*
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* @static
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* @access protected
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* @return object PEAR_Error
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* @param mixed $error
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* @param int $code
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*/
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static function raiseError($error = null, $code = null)
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{
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require_once 'PEAR.php';
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return PEAR::raiseError($error, $code);
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}
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}
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?>
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