(PHP 4 >= 4.1.0, PHP 5, PHP 7)
version_compare — Compares two "PHP-standardized" version number strings
version_compare ( string $version1 , string $version2 ) : int
version_compare ( string $version1 , string $version2 , string $operator ) : bool
version_compare() compares two "PHP-standardized" version number strings.
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 compares the parts starting from left to right. If a part contains special version strings these are handled in the following order: any string not found in this list
< dev
< alpha
= a
< beta
= b
< RC
= rc
< #
< pl
= p
. 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.
version1
First version number.
version2
Second version number.
operator
If the third optional operator
argument is specified, test for a particular relationship. The possible operators are: <
, lt
, <=
, le
, >
, gt
, >=
, ge
, ==
, =
, eq
, !=
, <>
, ne
respectively.
This parameter is case-sensitive, values should be lowercase.
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. If an unsupported operator
is given, null
is returned.
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, '7.0.0') >= 0) { echo 'I am at least PHP version 7.0.0, my version: ' . PHP_VERSION . "\n"; } if (version_compare(PHP_VERSION, '5.3.0') >= 0) { 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 at least PHP version 5.0.0, my version: ' . PHP_VERSION . "\n"; } if (version_compare(PHP_VERSION, '5.0.0', '<')) { echo 'I am still PHP 4, my version: ' . PHP_VERSION . "\n"; } ?>
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).
Note:
Special version strings such as
alpha
andbeta
are case sensitive. Version strings from arbitrary sources that do not adhere to the PHP standard may need to be lowercased via strtolower() before calling version_compare().
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.version-compare.php