version_compare
(PHP 4 >= 4.0.7, PHP 5) version_compare — Compares two "PHP-standardized" version number strings
Description
mixed version_compare
( string $version1
, string $version2
[, string $operator
] )
The function first replaces _, - and
+ with a dot . in the version
strings and also inserts dots . before and after any
non number so that for example '4.3.2RC1' becomes '4.3.2.RC.1'. Then it
splits the results like if you were using explode('.', $ver). Then it
compares the parts starting from left to right. If a part contains
special version strings these are handled in the following order:
dev < alpha =
a < beta =
b < RC <
pl. This way not only versions with different levels
like '4.1' and '4.1.2' can be compared but also any PHP specific version
containing development state.
Parameters
-
version1
-
First version number.
-
version2
-
Second version number.
-
operator
-
If you specify the third optional operator
argument, you can test for a particular relationship. The
possible operators are: <,
lt, <=,
le, >,
gt, >=,
ge, ==,
=, eq,
!=, <>,
ne respectively.
This parameter is case-sensitive, so values should be lowercase.
Return Values
By default, version_compare() returns
-1 if the first version is lower than the second,
0 if they are equal, and
1 if the second is lower.
When using the optional operator
argument, the
function will return TRUE if the relationship is the one specified
by the operator, FALSE otherwise.
Examples
The examples below use the PHP_VERSION constant,
because it contains the value of the PHP version that is executing
the code.
Example #1 version_compare() examples
<?php
if (version_compare(PHP_VERSION, '6.0.0') === 1) {
echo 'I am at least PHP version 6.0.0, my version: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.3.0') === 1) {
echo 'I am at least PHP version 5.3.0, my version: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.0.0', '>')) {
echo 'I am using PHP 5, my version: ' . PHP_VERSION . "\n";
}
if (version_compare(PHP_VERSION, '5.0.0', '<')) {
echo 'I am using PHP 4, my version: ' . PHP_VERSION . "\n";
}
?>
Notes
Note:
The PHP_VERSION constant holds current PHP version.
Note:
Note that pre-release versions, such as 5.3.0-dev, are considered
lower than their final release counterparts (like 5.3.0).
 add a note
User Contributed Notes
Compares two "PHP-standardized" version number strings
There are no user contributed notes for this page.
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