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# phpversion

(PHP 4, PHP 5)

phpversion — Gets the current PHP version

### 설명

string phpversion ([ string `$extension` ] )

Returns a string containing the version of the currently running PHP parser or extension.

### 인수

`extension`

  An optional extension name.

### 반환값

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.

### 예제

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'))
{
$version = PHP_VERSION;
define('PHP_VERSION_ID', ($version{0} * 10000 + $version{2} * 100 + $version{4}));
}
// PHP_VERSION_ID is defined as a number, where the higher the number
// is, the newer a PHP version is used. Its 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{2});
define('PHP_RELEASE_VERSION', $version{4});
// and so on, ...
}
?>`

### 주의

> Note: This information is also available in the predefined constant `PHP_VERSION`. More versioning information is available using the `PHP_VERSION_*` constants.

### 참고

- version_compare() - Compares two "PHP-standardized" version number strings
- phpinfo() - Outputs lots of PHP information
- phpcredits() - Prints out the credits for PHP
- php_logo_guid() - Gets the logo guid
- zend_version() - 현재 젠드 엔진의 버전을 얻습니다

phpinfo
putenv
PHP Options/Info 함수 목록
PHP Manual