Yes; I was incorrect. However "1.0pl" is greater than "1.0.1", since "pl" comes after any number (this should perhaps be noted in the documentation: dev < alpha = a < beta = b < RC < # < pl)
version_compare
(PHP 4 >= 4.0.7, PHP 5)
version_compare — ふたつの "PHP 標準" バージョン番号文字列を比較する
説明
mixed version_compare ( string $version1, string $version2 [, string $operator] )version_compare()は、ふたつの "PHP 標準" バージョン 番号文字列を比較します。この関数は、いくつかのバージョンの PHP でのみ 動作するプログラムを書きたい場合に有用です。
この関数はまず、バージョン文字列の _, -, + をドット . で置き換えます。 さらに、数値でない部分の前後にドット . を追加します。 例えば '4.3.2RC1' は '4.3.2.RC.1' となります。 次に、explode('.', $ver) とするのと同じように結果を分割し、左から右へ 各部分を比較していきます。特殊な文字列が含まれている場合は以下の順で 並べ替えます: dev < alpha = a < beta = b < RC < pl. この方法により、'4.1' と '4.1.2' のようなバージョンの違いだけではなく PHP 固有の開発ステータスの違いも判断することが可能となります。
パラメータ
- version1
最初のバージョン番号。
- version2
ふたつめのバージョン番号。
- operator
三番目のオプション引数 operator を指定した場合、 特定の関係を調べることが可能です。指定可能な演算子を以下に示します。 <, lt, <=, le, >, gt, >=, ge, ==, =, eq, !=, <>, ne この引数を用いると、この関数はこの演算子により指定された関係が 成り立つ場合に TRUE 、そうでない場合に FALSE を返します。
返り値
version_compare()は、最初のバージョンが二番目よりも小さい場合に -1、等しい場合に 0、二番目のほうが小さい場合に +1 を返します。
例
例 1812. version_compare() の例
<?php
// -1 を表示します
echo version_compare("4.0.4", "4.0.6");
// これらはすべて 1 を表示します
echo version_compare("4.0.4", "4.0.6", "<");
echo version_compare("4.0.6", "4.0.6", "eq");
?>
注意
注意: PHP_VERSION 定数には現在の PHP のバージョンが格納されます。
version_compare
Hayley Watson
31-Jul-2007 02:31
31-Jul-2007 02:31
opendb at iamvegan dot net
12-Jun-2007 05:26
12-Jun-2007 05:26
My concern at this point, is that Hayley Watson's comments may confuse some people - it did me, so I did some more investigation before replying...
According to all the unit tests (15) I have written using version_compare, I believe Hayley Watson is incorrect. For example, all of these calls are true.
function testVersionBeta3ToBeta4()
{
$this->assertTrue(opendb_version_compare('1.0b3', '1.0a4', '>'), '1.0b3 > 1.0a4');
}
function testVersionBeta6ToReleaseCandidate1()
{
$this->assertTrue(opendb_version_compare('1.0RC1', '1.0b6', '>'), 'RC1 > 1.0b6');
}
So how is this any different (which does not return true)
function testVersion10pl1To101()
{
$this->assertTrue(opendb_version_compare('1.0.1', '1.0pl1', '>'), '1.0.1 > 1.0pl1');
}
However when its changed to:
unction testVersion10pl1To101()
{
$this->assertTrue(opendb_version_compare('1.0.1', '1.0pl1', '>'), '1.0.1 > 1.0.0pl1');
}
It works fine. I do believe that the version_compare function works as follows:
$version1 $operator $version2
Hayley Watson
11-Jun-2007 10:47
11-Jun-2007 10:47
To correct opendb at iamvegan dot net's misapprehension: "1.0pl1" is regarded as less than "1.0.1". But the call as you've written it asks whether "1.0pl1" is greater (">") than "1.0.1" - which it isn't.
opendb at iamvegan dot net
11-Jun-2007 09:01
11-Jun-2007 09:01
Something that may trip some folks up, but is useful to mention is that the following version comparison does not work quite as I expected:
version_compare('1.0.1', '1.0pl1', '>')
However, its quite easy to get working:
version_compare('1.0.1', '1.0.0pl1', '>')
MagicalTux at ookoo dot org
23-Oct-2006 10:38
23-Oct-2006 10:38
To answer elmuerte's note (06-Jul-2006 03:24), you'd even better remove spaces than replacing them.
<?php
version_compare("1.0.0.0beta1", "1.0.0.0alpha2") == 1; // good
version_compare("1.0.0.0-beta 1", "1.0.0.0-alpha 2") == 1;
version_compare("1.0.0.0.beta 1", "1.0.0.0.alpha 2") == 1;
version_compare("1.0.0.0.beta.1", "1.0.0.0.alpha.2") == 1;
?>
arnoud at procurios dot nl
29-Sep-2004 06:28
29-Sep-2004 06:28
If you're careful, this function actualy works quite nicely for comparing version numbers from programs other than PHP itself. I've used it to compare MySQL version numbers. The only issue is that version_compare doesn't recognize the 'gamma' addition that mysql uses as being later than 'alpha' or 'beta', because the latter two are treated specially. If you keep this in mind though, you should have no problems.
mina86 at tlen dot pl
01-Jul-2004 11:40
01-Jul-2004 11:40
Here's a wrapper which is more tolerant as far as order of arguments is considered:
<?php
function ver_cmp($arg1, $arg2 = null, $arg3 = null) {
static $phpversion = null;
if ($phpversion===null) $phpversion = phpversion();
switch (func_num_args()) {
case 1: return version_compare($phpversion, $arg1);
case 2:
if (preg_match('/^[lg][te]|[<>]=?|[!=]?=|eq|ne|<>$/i', $arg1))
return version_compare($phpversion, $arg2, $arg1);
elseif (preg_match('/^[lg][te]|[<>]=?|[!=]?=|eq|ne|<>$/i', $arg2))
return version_compare($phpversion, $arg1, $arg2);
return version_compare($arg1, $arg2);
default:
$ver1 = $arg1;
if (preg_match('/^[lg][te]|[<>]=?|[!=]?=|eq|ne|<>$/i', $arg2))
return version_compare($arg1, $arg3, $arg2);
return version_compare($arg1, $arg2, $arg3);
}
}
?>
It also uses phpversion() as a default version if only one string is present. It can make your code look nicer 'cuz you can now write:
<?php if (ver_cmp($version1, '>=', $version2)) something; ?>
and to check a version string against the PHP's version you might use:
<?php if (ver_cmp('>=', $version)) something; ?>
instead of using phpversion().
aidan at php dot net
26-Jun-2004 07:02
26-Jun-2004 07:02
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat
eric at themepark dot com
22-Jun-2004 01:50
22-Jun-2004 01:50
[editors note]
snipbit fixed after comment from Matt Mullenweg
--jm
[/editors note]
so in a nutshell... I believe it works best like this:
<?php
if (version_compare(phpversion(), "4.3.0", ">=")) {
// you're on 4.3.0 or later
} else {
// you're not
}
?>
sam at wyvern dot non-spammers-remove dot com dot au
24-May-2004 03:18
24-May-2004 03:18
Actually, it works to any degree:
<?php
version_compare('1.2.3.4RC7.7', '1.2.3.4RC7.8')
version_compare('8.2.50.4', '8.2.52.6')
?>
will both give -1 (ie the left is lower than the right).