1		<?php
			2		/* vim: set expandtab tabstop=4 shiftwidth=4: */
			3		// +----------------------------------------------------------------------+
			4		// | PHP Version 4                                                        |
			5		// +----------------------------------------------------------------------+
			6		// | Copyright (c) 1997-2004 The PHP Group                                |
			7		// +----------------------------------------------------------------------+
			8		// | This source file is subject to version 3.0 of the PHP license,       |
			9		// | that is bundled with this package in the file LICENSE, and is        |
			10		// | available at through the world-wide-web at                           |
			11		// | http://www.php.net/license/3_0.txt.                                  |
			12		// | If you did not receive a copy of the PHP license and are unable to   |
			13		// | obtain it through the world-wide-web, please send a note to          |
			14		// | license@php.net so we can mail you a copy immediately.               |
			15		// +----------------------------------------------------------------------+
			16		// | Authors: Philippe Jausions <Philippe.Jausions@11abacus.com>          |
			17		// |          Aidan Lister <aidan@php.net>                                |
			18		// +----------------------------------------------------------------------+
			19		//
			20		// $Id: version_compare.php,v 1.1 2004-10-26 18:22:16 kostja Exp $
			21		//
			22
			23
			24		/**
			25		* Replace version_compare()
			26		*
			27		* @category    PHP
			28		* @package     PHP_Compat
			29		* @link        http://php.net/version_compare
			30		* @author      Philippe Jausions <Philippe.Jausions@11abacus.com>
			31		* @author      Aidan Lister <aidan@php.net>
			32		* @version     $Revision: 1.1 $
			33		* @since       PHP 4.1.0
			34		* @require     PHP 4.0.1 (trigger_error)
			35		*/
			36		if (!function_exists('version_compare')) {
			37
			38		function version_compare ($version1, $version2, $operator = '<')
			39		{
			40		// Check input
			41		if (!is_scalar($version1)) {
			42		trigger_error('version_compare() expects parameter 1 to be string, ' . gettype($version1) . ' given', E_USER_WARNING);
			43		return null;
			44		}
			45
			46		if (!is_scalar($version2)) {
			47		trigger_error('version_compare() expects parameter 2 to be string, ' . gettype($version2) . ' given', E_USER_WARNING);
			48		return null;
			49		}
			50
			51		if (!is_scalar($operator)) {
			52		trigger_error('version_compare() expects parameter 3 to be string, ' . gettype($operator) . ' given', E_USER_WARNING);
			53		return null;
			54		}
			55
			56		// Standardise versions
			57		$v1 = explode('.',
			58		str_replace('..', '.',
			59		preg_replace('/([^0-9\.]+)/', '.$1.',
			60		str_replace(array('-', '_', '+'), '.',
			61		trim($version1)))));
			62
			63		$v2 = explode('.',
			64		str_replace('..', '.',
			65		preg_replace('/([^0-9\.]+)/', '.$1.',
			66		str_replace(array('-', '_', '+'), '.',
			67		trim($version2)))));
			68
			69		// Replace empty entries at the start of the array
			70		while (empty($v1[0]) && array_shift($v1)) {}
			71		while (empty($v2[0]) && array_shift($v2)) {}
			72
			73		// Describe our release states
			74		$versions = array(
			75		'dev'   => 0,
			76		'alpha' => 1,
			77		'a'     => 1,
			78		'beta'  => 2,
			79		'b'     => 2,
			80		'RC'    => 3,
			81		'pl'    => 4);
			82
			83		// Loop through each segment in the version string
			84		$compare = 0;
			85		for ($i = 0, $x = min(count($v1), count($v2)); $i < $x; $i++)
			86		{
			87		if ($v1[$i] == $v2[$i]) {
			88		continue;
			89		}
			90		if (is_numeric($v1[$i]) && is_numeric($v2[$i])) {
			91		$compare = ($v1[$i] < $v2[$i]) ? -1 : 1;
			92		}
			93		elseif (is_numeric($v1[$i])) {
			94		$compare = 1;
			95		}
			96		elseif (is_numeric($v2[$i])) {
			97		$compare = -1;
			98		}
			99		elseif (isset($versions[$v1[$i]]) && isset($versions[$v2[$i]])) {
			100		$compare = ($versions[$v1[$i]] < $versions[$v2[$i]]) ? -1 : 1;
			101		}
			102		else {
			103		$compare = strcmp($v2[$i], $v1[$i]);
			104		}
			105
			106		break;
			107		}
			108
			109		// If previous loop didn't find anything, compare the "extra" segments
			110		if ($compare == 0) {
			111		if (count($v2) > count($v1))
			112		{
			113		if (isset($versions[$v2[$i]])) {
			114		$compare = ($versions[$v2[$i]] < 4) ? 1 : -1;
			115		} else {
			116		$compare = -1;
			117		}
			118		}
			119		elseif (count($v2) < count($v1))
			120		{
			121		if (isset($versions[$v1[$i]])) {
			122		$compare = ($versions[$v1[$i]] < 4) ? -1 : 1;
			123		} else {
			124		$compare = 1;
			125		}
			126		}
			127		}
			128
			129		// Compare the versions
			130		if (func_num_args() > 2)
			131		{
			132		switch ($operator)
			133		{
			134		case '>':
			135		case 'gt':
			136		return (bool) ($compare > 0);
			137		break;
			138		case '>=':
			139		case 'ge':
			140		return (bool) ($compare >= 0);
			141		break;
			142		case '<=':
			143		case 'le':
			144		return (bool) ($compare <= 0);
			145		break;
			146		case '==':
			147		case '=':
			148		case 'eq':
			149		return (bool) ($compare == 0);
			150		break;
			151		case '<>':
			152		case '!=':
			153		case 'ne':
			154		return (bool) ($compare != 0);
			155		break;
			156		case '':
			157		case '<':
			158		case 'lt':
			159		return (bool) ($compare < 0);
			160		break;
			161		default:
			162		return null;
			163		}
			164		}
			165
			166		return $compare;
			167		}
			168		}
			169
			170		?>