[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 — Compara dos números de versiones estandarizados de PHP
Descripción
version_compare() compara dos string de números de versiones estandarizados de PHP.
Esta función, en primer lugar reemplaza los _, - y
+ por puntos . y las cadenas de texto de
versiones y añade puntos . antes y después de cualquier
código no numérico, de manera que '4.3.2RC1' sería '4.3.2.RC.1'. Después,
compara cada una de las partes, de izquierda a derecha. Si alguna parte contuviera
un texto especial de versión, se manejarían con el siguiente orden:
cualquier texto que no se encuentre en esta lista <
dev < alpha =
a < beta =
b < RC =
rc < # <
pl = p. De esta forma, no solo se pueden comparar
versiones con diferentes niveles, como '4.1' y '4.1.2', sino que también se pueden
comparar versiones específicas de PHP que contengan el estado de desarrollo en que se encuentran.
Parámetros
-
version1 -
Primer número de versión.
-
version2 -
Segundo número de versión.
-
operator -
Si se especifica el tercer argumento opcional
operator, se prueba para una relación en particular. Los posibles operadores son:<,lt,<=,le,>,gt,>=,ge,==,=,eq,!=,<>,nerespectivamente.Este parámetro es sensible a mayúsculas, por lo que los valores debes estar en minúsculas.
Valores devueltos
Por omisión, version_compare() devuelve
-1 si la primera versión es inferior a la segunda,
0 si son iguales, y
1 si la segunda es inferior.
Al usar el argumento opcional operator, la
función de volverá true si se cumpliera la relación especificada por
el operador, o false en caso contrario.
Ejemplos
Los siguientes ejemplos usan la constante PHP_VERSION,
ya que esta contiene el valor de la versión de PHP con que se está ejecutando
el código.
Ejemplo #1 Ejemplos de version_compare()
<?php
if (version_compare(PHP_VERSION, '6.0.0') >= 0) {
echo 'Soy al menos la versión 6.0.0 de PHP, mi versión: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
echo 'Soy al menos la versión 5.3.0 de PHP, mi versión: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.0.0', '>=')) {
echo 'Estoy usando la versión 5 de PHP, mi versión: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.0.0', '<')) {
echo 'Estoy usando la versión 4 de PHP, mi versión: ' . PHP_VERSION . "\n";
}
?>
Notas
Nota:
La constante
PHP_VERSIONalmacena la versión de PHP en uso.
Nota:
Tenga presente que las versiones preeliminares, como por ejemplo 5.3.0-dev, se las considera inferiroes a la versión final (como por ejemplo 5.3.0).
Nota:
Las cadenas de versiones especiales como
alphaybetason sensibles a mayúsculas/minúsculas. Las cadenas de versiones desde fuentes arbitrarias que no se adhieren al estándar de PHP podrían necesitar ser convertidas a minúsculas mediante strtolower() antes de llamar a version_compare().
Ver también
- phpversion() - Obtiene la versión de PHP
- php_uname() - Devuelve información sobre el sistema operativo en que se está ejecutando PHP
- function_exists() - Devuelve true si la función dada ha sido definida
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;
}
?>
