[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
}
?>
version_compare
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
version_compare — Vergleicht zwei Versionsnummern im PHP-Versionsformat
Beschreibung
version_compare
( string
$version1
, string $version2
) : int
version_compare
( string
$version1
, string $version2
, string $operator
) : boolversion_compare() vergleicht zwei dem PHP-Versionsformat angeglichene Versionsnummern.
Zuerst ersetzt die Funktion _, - und
+ durch einen Punkt . in den
Versionsangaben und setzt vor und nach jeder Kette aus nicht-numerischen
Zeichen Punkte ein, sodass beispielsweise '4.3.2RC1' zu '4.3.2.RC.1' wird.
Anschließend werden von links nach rechts die Teile verglichen. Wenn ein
Teil spezielle Zeichen enthält, werden diese nach der folgenden Reihenfolge
behandelt: jede Zeichenkette, die nicht in dieser Liste
vorkommt < dev <
alpha = a <
beta = b < RC =
rc < # < pl
= p. Auf diese Weise können nicht nur Versionen
verschiedener Tiefe wie '4.1' und '4.1.2', sondern auch alle anderen
Versionen verglichen werden, die sich auf bestimmte Entwicklungsstadien von
PHP beziehen.
Parameter-Liste
-
version1 -
Die erste Versionsnummer.
-
version2 -
Die zweite Versionsnummer.
-
operator -
Wenn der optionale Parameter
operatorangegeben ist, wird auf ein bestimmtes Verhältnis geprüft. Mögliche Operatoren sind:<,lt,<=,le,>,gt,>=,ge,==,=,eq,!=,<>undne.Dieser Parameter berücksicht die Groß- und Kleinschreibung, die Werte sollten alle kleingeschrieben werden.
Rückgabewerte
Standardmäßig gibt version_compare()
-1 zurück, wenn die erste Version kleiner ist als die
zweite, 0, wenn die Versionen gleich sind und
1, wenn die zweite Version kleiner ist.
Wenn der optionale Parameter operator übergeben
wurde, gibt die Funktion true oder false zurück, je nach dem, ob das
mit dem Operator definierte Verhältnis der Wahrheit entspricht oder nicht.
Wird ein nicht unterstützter operator angegeben,
wird null zurückgegeben.
Beispiele
Das untenstehende Beispiel verwendet die Konstante
PHP_VERSION, die die Version des aktuell ausführenden
PHP-Interpreters enthält.
Beispiel #1 version_compare()-Beispiele
<?php
if (version_compare(PHP_VERSION, '7.0.0') >= 0) {
echo 'Ich bin mindestens PHP 7.0.0, meine Version: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
echo 'Ich bin mindestens PHP 5.3.0, meine Version: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.0.0', '>=')) {
echo 'Ich bin mindestens PHP 5, meine Version: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.0.0', '<')) {
echo 'Ich bin noch PHP 4, meine Version: ' . PHP_VERSION . "\n";
}
?>
Anmerkungen
Hinweis:
Die Konstante
PHP_VERSIONenthält die aktuelle PHP-Version
Hinweis:
Vorveröffentlichte Versionen wie 5.3.0-dev werden als kleiner erkannt als ihre finalen Veröffentlichungen wie 5.3.0.
Hinweis:
Bei besonderen Versionszeichenketten wie
alphaundbetawird zwischen Groß-/Kleinschreibung unterschieden. Versionszeichenketten aus beliebigen Quellen, die nicht den PHP-Standard einhalten, müssen bei Bedarf mit strtolower() in Kleinschreibung umgewandelt werden, bevor version_compare() aufgerufen wird.
Siehe auch
- phpversion() - Liefert die aktuelle PHP-Version
- php_uname() - Returns information about the operating system PHP is running on
- function_exists() - Falls die angegebene Funktion definiert ist, wird true zurück gegeben
add a note
User Contributed Notes 13 notes
eric at themepark dot com ¶
19 years ago
insid0r at yahoo dot com ¶
15 years ago
Since this function considers 1 < 1.0 < 1.0.0, others might find this function useful (which considers 1 == 1.0):
<?php
//Compare two sets of versions, where major/minor/etc. releases are separated by dots.
//Returns 0 if both are equal, 1 if A > B, and -1 if B < A.
function version_compare2($a, $b)
{
$a = explode(".", rtrim($a, ".0")); //Split version into pieces and remove trailing .0
$b = explode(".", rtrim($b, ".0")); //Split version into pieces and remove trailing .0
foreach ($a as $depth => $aVal)
{ //Iterate over each piece of A
if (isset($b[$depth]))
{ //If B matches A to this depth, compare the values
if ($aVal > $b[$depth]) return 1; //Return A > B
else if ($aVal < $b[$depth]) return -1; //Return B > A
//An equal result is inconclusive at this point
}
else
{ //If B does not match A to this depth, then A comes after B in sort order
return 1; //so return A > B
}
}
//At this point, we know that to the depth that A and B extend to, they are equivalent.
//Either the loop ended because A is shorter than B, or both are equal.
return (count($a) < count($b)) ? -1 : 0;
}
?>
mindplay.dk ¶
11 years ago
This little script can perhaps help you understand version comparison a little better - the output is displayed in the comment at the top. Tweak the list of versions if you need more examples...
<?php
# 1 lt 1.0
# 1.0 lt 1.01
# 1.01 eq 1.1
# 1.1 lt 1.10
# 1.10 gt 1.10b
# 1.10b lt 1.10.0
header('Content-type: text/plain');
$versions = array(
'1',
'1.0',
'1.01',
'1.1',
'1.10',
'1.10b',
'1.10.0',
);
$comps = array(
-1 => 'lt',
0 => 'eq',
1 => 'gt'
);
foreach ($versions as $version) {
if (isset($last)) {
$comp = version_compare($last, $version);
echo str_pad($last,8,' ',STR_PAD_LEFT) . " {$comps[$comp]} {$version}\n";
}
$last = $version;
}
?>
rlerne at gmail dot com ¶
9 years ago
What PHP.net page is any good without a classy userland implementation of a function already provided by PHP? Generally, there are pseudo-benchmarks and reasons why you'd want to use their "far superior" implementations.
Since exit is a difficult construct to implement, and exit cannot be called using variable functions, this function is <blink>BETTER</blink>.
While you cannot use this code without parentheses, you'll find that this exit function improves your site's performance with at least 25 teraflops of flux computing power!
I used to be a fan of die;, I even tried to use exit;, but now; I'm a true-blue userland_exit() fan, now with 20% more.*
*-Over the top competing brand.
<?php
function userland_exit($death_call=null)
{
if (version_compare(PHP_VERSION,'4.2.0','<'))
echo $death_call;
elseif (!is_int($death_call))
echo $death_call;
error_reporting(0);
trigger_error(null,E_USER_ERROR);
}
userland_exit("I'm dead");
?>
arnoud at procurios dot nl ¶
19 years ago
If you're careful, this function actualy works quite nicely for comparing version numbers from programs other than PHP itself. I've used it to compare MySQL version numbers. The only issue is that version_compare doesn't recognize the 'gamma' addition that mysql uses as being later than 'alpha' or 'beta', because the latter two are treated specially. If you keep this in mind though, you should have no problems.
Bob Ray ¶
8 years ago
Note that both leading and trailing spaces on your version numbers can break version_compare().
Tested on PHP 5.6.8:
<?php
echo "\nShould be 0";
echo "\n '1.0.0-pl' vs. '1.0.0-pl' ---> " . version_compare('1.0.0-pl', '1.0.0-pl');
echo "\n '1.0.0-pl' vs. ' 1.0.0-pl' ---> " . version_compare('1.0.0-pl', ' 1.0.0-pl');
echo "\n ' 1.0.0-pl' vs. '1.0.0-pl' ---> " . version_compare(' 1.0.0-pl', '1.0.0-pl');
echo "\n '1.0.0-pl' vs. '1.0.0-pl ' ---> " . version_compare('1.0.0-pl', '1.0.0-pl ');
echo "\n '1.0.0-pl ' vs. '1.0.0-pl' ---> " . version_compare('1.0.0-pl ', '1.0.0-pl');
echo "\n\nShould be 1";
echo "\n '1.1.1-pl' vs. '1.0.0-pl' ---> " . version_compare('1.1.1-pl', '1.0.0-pl');
echo "\n ' 1.1.1-pl' vs. '1.0.0-pl' ---> " . version_compare(' 1.1.1-pl', '1.0.0-pl');
echo "\n\nShould be -1";
echo "\n '1.0.0-pl' vs. '1.1.1-pl' ---> " . version_compare('1.0.0-pl', '1.1.1-pl');
echo "\n '1.0.0-pl' vs. ' 1.1.1-pl' ---> " . version_compare('1.0.0-pl', ' 1.1.1-pl');
/* Output
Should be 0
'1.0.0-pl' vs. '1.0.0-pl' ---> 0
'1.0.0-pl' vs. ' 1.0.0-pl' ---> 1
' 1.0.0-pl' vs. '1.0.0-pl' ---> -1
'1.0.0-pl' vs. '1.0.0-pl ' ---> 1
'1.0.0-pl ' vs. '1.0.0-pl' ---> -1
Should be 1
'1.1.1-pl' vs. '1.0.0-pl' ---> 1
' 1.1.1-pl' vs. '1.0.0-pl' ---> -1
Should be -1
'1.0.0-pl' vs. '1.1.1-pl' ---> -1
'1.0.0-pl' vs. ' 1.1.1-pl' ---> 1
*/
ivan maruca ¶
7 years ago
function versionCompare($version1, $operator, $version2) {
$_fv = intval ( trim ( str_replace ( '.', '', $version1 ) ) );
$_sv = intval ( trim ( str_replace ( '.', '', $version2 ) ) );
if (strlen ( $_fv ) > strlen ( $_sv )) {
$_sv = str_pad ( $_sv, strlen ( $_fv ), 0 );
}
if (strlen ( $_fv ) < strlen ( $_sv )) {
$_fv = str_pad ( $_fv, strlen ( $_sv ), 0 );
}
return version_compare ( ( string ) $_fv, ( string ) $_sv, $operator );
}
var_dump ( versionCompare ( '2.9', '<', '2.9.6' ) ); // true
var_dump ( versionCompare ( '2.9', '>', '2.9.6' ) ); // false
var_dump ( versionCompare ( '2.9', '<', '3.0' ) ); // true
var_dump ( versionCompare ( '2.9', '<=', '2.8.9' ) ); // false
var_dump ( versionCompare ( '2.9', '!=', '2.8.9' ) ); // true
var_dump ( versionCompare ( '2.8', '!=', '2.8.0' ) ); // false
var_dump ( versionCompare ( '2.9', '==', '2.9.0' ) ); // true
var_dump ( versionCompare ( '2.9', '==', '2.9.1' ) ); // false
var_dump ( versionCompare ( '3.0 beta', '>', '2.9.9' ) ); // true
opendb at iamvegan dot net ¶
16 years ago
Something that may trip some folks up, but is useful to mention is that the following version comparison does not work quite as I expected:
version_compare('1.0.1', '1.0pl1', '>')
However, its quite easy to get working:
version_compare('1.0.1', '1.0.0pl1', '>')
rogier ¶
12 years ago
Please note that supplying an operator that is not listed (e.g. ===), this function returns NULL instead of false.
Tested on PHP5.3.0, Win32
sam at wyvern dot non-spammers-remove dot com dot au ¶
19 years ago
Actually, it works to any degree:
<?php
version_compare('1.2.3.4RC7.7', '1.2.3.4RC7.8')
version_compare('8.2.50.4', '8.2.52.6')
?>
will both give -1 (ie the left is lower than the right).
loaded67 at hotmail dot com ¶
14 years ago
This function is also usefull when working with multiple installations.
As php5.3+ will not have E_STRICT in the error_reporting anymore you can state:
<?php
ini_set('error_reporting', (version_compare(PHP_VERSION, '5.3.0', '<') ? E_ALL|E_STRICT : E_ALL));
?>
Giving you all the error error reporting you want...
mina86 at tlen dot pl ¶
19 years ago
Here's a wrapper which is more tolerant as far as order of arguments is considered:
<?php
function ver_cmp($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('>=', $version)) something; ?>
instead of using phpversion().
Jonathon dot Reinhart at gmail dot com ¶
16 years ago
I know this is somewhat incomplete, but it did a fair enough job for what I needed. I was writing some code that needed done immediately on a server that was to be upgraded some time in the future. Here is a quick replacement for version_compare (without the use of the operator argument). Feel free to add to this / complete it.
<?php
function version_compare2($version1, $version2)
{
$v1 = explode('.',$version1);
$v2 = explode('.',$version2);
if ($v1[0] > $v2[0])
$ret = 1;
else if ($v1[0] < $v2[0])
$ret = -1;
else // Major ver are =
{
if ($v1[1] > $v2[1])
$ret = 1;
else if ($v1[1] < $v2[1])
$ret = -1;
else // Minor ver are =
{
if ($v1[2] > $v2[2])
$ret = 1;
else if ($v1[2] < $v2[2])
$ret = -1;
else
$ret = 0;
}
}
return $ret;
}
?>
