phpinfo
To know, what are the {php} extensions loaded & version of extensions :
<?php
foreach (get_loaded_extensions() as $i => $ext)
{
echo $ext .' => '. phpversion($ext). '<br/>';
}
?>
phpversion
(PHP 4, PHP 5)
phpversion — Gets the current PHP version
Description
string phpversion
([ string
$extension
] )Returns a string containing the version of the currently running PHP parser or extension.
Parameters
-
extension -
An optional extension name.
Return Values
If the optional extension parameter is
specified, phpversion() returns the version of that
extension, or FALSE if there is no version information associated or
the extension isn't enabled.
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
- php_logo_guid() - Gets the logo guid
- zend_version() - Gets the version of the current Zend engine
add a note
User Contributed Notes
phpversion - [5 notes]
pavankumar at tutorvista dot com ¶
2 years ago
bitworks at web dot de ¶
3 years ago
to realize if the actual version ist newer than '5.2.10'
simply use:
<?php
if (strnatcmp(phpversion(),'5.2.10') >= 0)
{
# equal or newer
}
else
{
# not sufficiant
}
?>
dmitry DOT seredinov AT gmail DOT com ¶
4 years ago
To simple receive a major PHP version value (e.g., 5.2), you can use next:
<?php
// Output below will looks like '5.2', depends to your version
echo floatval(phpversion());
?>
Sam Yong - hellclanner at live dot com ¶
3 years ago
Take note that if you pass phpversion() with an empty string, eg.
<?php
echo phpversion('');
?>
It will not return anything, since it cannot find an extension with the name string(0) ''.
pl DOT baasch AT skycube DOT net ¶
4 years ago
In a addition to phpversion,..
if you've got a system like ubuntu or some else, you get
<?php
echo phpversion(); // 5.2.4-2ubuntu5.2
?>
To fix this, use the following:
<?php
echo substr(phpversion(),0,strpos(phpversion(), '-'));
?>