phpversion
(PHP 4, PHP 5, PHP 7, PHP 8)
phpversion — Gets the current PHP version
Description
phpversion(?string $extension = null): string|false
Returns a string containing the version of the currently running PHP parser or extension.
Parameters
-
extension
-
An optional extension name.
Return Values
Returns the current PHP version as a string. If a string argument is provided for extension
parameter, phpversion() returns the version of that extension, or false
if there is no version information associated or the extension isn't enabled.
Changelog
Version | Description |
---|---|
8.0.0 | extension is nullable now. |
Examples
Example #1 phpversion() example
<?php // prints e.g. 'Current PHP version: 4.1.1' echo 'Current PHP version: ' . phpversion(); // prints e.g. '2.0' or nothing if the extension isn't enabled echo phpversion('tidy'); ?>
Example #2 PHP_VERSION_ID
example and usage
<?php // PHP_VERSION_ID is available as of PHP 5.2.7, if our // version is lower than that, then emulate it if (!defined('PHP_VERSION_ID')) { $version = explode('.', PHP_VERSION); define('PHP_VERSION_ID', ($version[0] * 10000 + $version[1] * 100 + $version[2])); } // PHP_VERSION_ID is defined as a number, where the higher the number // is, the newer a PHP version is used. It's defined as used in the above // expression: // // $version_id = $major_version * 10000 + $minor_version * 100 + $release_version; // // Now with PHP_VERSION_ID we can check for features this PHP version // may have, this doesn't require to use version_compare() everytime // you check if the current PHP version may not support a feature. // // For example, we may here define the PHP_VERSION_* constants thats // not available in versions prior to 5.2.7 if (PHP_VERSION_ID < 50207) { define('PHP_MAJOR_VERSION', $version[0]); define('PHP_MINOR_VERSION', $version[1]); define('PHP_RELEASE_VERSION', $version[2]); // and so on, ... } ?>
Notes
Note:
This information is also available in the predefined constant
PHP_VERSION
. More versioning information is available using thePHP_VERSION_*
constants.
See Also
- PHP_VERSION constants
- version_compare() - Compares two "PHP-standardized" version number strings
- phpinfo() - Outputs information about PHP's configuration
- phpcredits() - Prints out the credits for PHP
- zend_version() - Gets the version of the current Zend engine
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.phpversion.php