<?php
/*------------------------------------------------------------------------------
// File: [Platform/Versioning/]proc.php
// Description: PHP 3, 4, 5 versioning utility file
// Purpose: This utility file determines the running PHP version and makes
// comparisons
// Version: 1.0
// Application: PHCL-WTK
// Author: Asher Kadar Wolfstein
// Email: asher@asherwolf.com
// Homepage: http://www.asherwolf.com/projects/php/platform/versioning/index.html
//------------------------------------------------------------------------------
//
// ALL CODE AND (GENERATED) DOCUMENTATION
// IS COPYRIGHT © 2007 WOLFSTEIN CONSULTING (COLORADO)
//
// LICENSE INFORMATION
//
// http://www.asherwolf.com/code_license_1.php?p=Platform_versioning&l=lgpl&l2=c30
//
// THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY INCLUDING THE IMPLIED
// WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
//
// THIS FILE IS PART OF 'Platform_versioning'.
//
// 'Platform_versioning' IS FREE SOFTWARE; YOU CAN REDISTRIBUTE IT AND/OR
// MODIFY IT UNDER THE TERMS OF THE GNU LESSER GENERAL PUBLIC LICENSE AS
// PUBLISHED BY THE FREE SOFTWARE FOUNDATION;
//
// 'Platform_versioning' IS DISTRIBUTED IN THE HOPE THAT IT WILL BE USEFUL,
// BUT WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF
// MERCHANTIBILITY OR FITNESS FOR A PARTICULAR PURPOSE. SEE THE
// GNU LESSER GENERAL PUBLIC LICENSE FOR MORE DETAILS.
//
// YOU SHOULD HAVE RECEIVED A COPY OF THE GNU LESSER GENERAL PUBLIC LICENSE
// ALONG WITH 'Platform_versioning'; IF NOT, WRITE TO THE FREE SOFTWARE
// FOUNDATION, INC., 51 FRANKLIN ST, FIFTH FLOOR, BOSTON, MA 02110-1301 USA
//
// http://www.opensource.org/licenses/lgpl-license.php
//
// FURTHER LICENSED UNDER THE CREATIVE COMMONS ATTRIBUTION 3.0 LICENSE
//
// http://creativecommons.org/licenses/by/3.0/
//
//------------------------------------------------------------------------------
// Revision History
//------------------------------------------------------------------------------
// Format: strftime - %D
// 07/01/2007 Created - Asher Wolfstein
//
//----------------------------------------------------------------------------*/
/**
* PHP 3, 4, 5 versioning utility file
*
* This utility file determines the running PHP version and makes comparisons
*
* @author Asher Wolfstein <asher@asherwolf.com>
* @copyright Copyright © 2007, Wolfstein Consulting (Colorado).
* @license http://www.asherwolf.com/code_license_1.php?p=Platform_versioning&l=lgpl&l2=c30 License Information
* @package platform
* @version 1.0
* @subpackage versioning
* @category compatibility
*/
/**
* Normalize a comparison operator string representation
*
* @see platform_versioning_compare_val()
* @param string $c Operator
* @return string Normalized operator
*/
function platform_versioning_normalize_comparison( $c ) {
// http://www.php.net/manual/en/function.version-compare.php#43710
if ( preg_match( '/^[lg][te]|=|eq|ne|<>$/i', $c ) ) {
switch( $c ) {
case 'lt':
return '<';
break;
case 'gt':
return '>';
break;
case 'ge':
return '>=';
break;
case 'le':
return '<=';
break;
case '=':
case 'eq':
return '==';
break;
case 'ne':
case '<>':
return '!=';
}
}
return $c;
}
/**
* This function enables variable operator value comparison
*
* @param mixed $v1 Left comparison operand
* @param mixed $v2 Right comparison operand
* @param $string $c Comparison operator
* @return boolean Result of comparison
*/
function platform_versioning_compare_val( $v1, $v2, $c ) {
$gt = $lt = $eq = $ne = false;
// http://www.php.net/manual/en/function.version-compare.php#43710
switch( platform_versioning_normalize_comparison( $c ) ) {
case '>':
$gt = true;
break;
case '<':
$lt = true;
break;
case '>=':
$gt = $eq = true;
break;
case '<=':
$lt = $eq = true;
break;
case '==':
$eq = true;
break;
case '!=':
$ne = true;
}
if ( ( $ne && ( $v1 != $v2 ) ) ||
( $eq && ( $v1 == $v2 ) ) ||
( $gt && ( $v1 > $v2 ) ) ||
( $lt && ( $v1 < $v2 ) ) ) {
return true;
}
return false;
}
/**
* Compares given version with running version the proper logic
*
* Uses version compare if available, if not applies the multi-tiered logic
* required for comparing versions.
*
* @param string $version Version to compare - phpversion() output perhaps
* @param string $comp Comparison operator
* @param string $sep String seperator
* @return boolean Whether the comparison is true or false
*/
function platform_compare_versions( $version, $comp, $sep = '.' ) {
$comp = platform_versioning_normalize_comparison( $comp );
list( $v1, $v2, $v3 ) = explode( '.', phpversion() );
// not the best
$v3_s = strlen( $v3 ) > 1 ? substr( $v3, 0, 1 ) : $v3;
if ( $v1 >= 4 ||
( $v1 == 4 && $v3_s >= 7 ) ) {
return version_compare( "$v1.$v2.$v3", $version, $comp );
} else {
// doesn't work with alphas or betas etc.
$v = explode( $sep, $version );
if ( isset( $v[2] ) ) {
$v[2] = strlen( $v[2] ) > 1 ? substr( $v[2], 0, 1 ) : $v[2];
}
$vc = count( $v );
$neq = strpos( $comp, '!' ) ? true : false;
if ( ( $vc == 1 && platform_versioning_compare_val( $v1, $v[0], $comp ) ) ||
( $vc == 2 && ( !$neq && ( (
platform_versioning_compare_val( $v1, $v[0], '==' ) &&
platform_versioning_compare_val( $v2, $v[1], $comp ) ) ||
platform_versioning_compare_val( $v1, $v[0], substr( $comp, 0, 1 ), 'x' ) ) ) ||
( $neq && (
platform_versioning_compare_val( $v1, $v[0], $comp ) ||
platform_versioning_compare_val( $v2, $v[1], $comp ) ) ) ) ||
( $vc == 3 && ( !$neq && ( (
platform_versioning_compare_val( $v1, $v[0], '==' ) &&
platform_versioning_compare_val( $v2, $v[1], '==' ) &&
platform_versioning_compare_val( $v3, $v[2], $comp ) ) ||
( platform_versioning_compare_val( $v1, $v[0], '==' ) &&
platform_versioning_compare_val( $v2, $v[1], $comp ) ) ||
platform_versioning_compare_val( $v1, $v[0], substr( $comp, 0, 1 ) ) ) ) ||
( $neq &&
( platform_versioning_compare_val( $v1, $v[0], $comp ) ||
platform_versioning_compare_val( $v1, $v[1], $comp ) ||
platform_versioning_compare_val( $v1, $v[2], $comp ) ) ) ) ) {
return true;
}
return false;
}
}
/**
* True if this file has been included
*
* @name PLATFORM_VERSIONING_CONF
*/
define( 'PLATFORM_VERSIONING_PROC_CONF', true );
?>
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