extension_loaded
(PHP 4, PHP 5)
extension_loaded — Find out whether an extension is loaded
Description
bool extension_loaded
( string
$name
)Finds out whether the extension is loaded.
Parameters
-
name -
The extension name.
You can see the names of various extensions by using phpinfo() or if you're using the CGI or CLI version of PHP you can use the -m switch to list all available extensions:
$ php -m [PHP Modules] xml tokenizer standard sockets session posix pcre overload mysql mbstring ctype [Zend Modules]
Return Values
Returns TRUE if the extension identified by name
is loaded, FALSE otherwise.
Examples
Example #1 extension_loaded() example
<?php
if (!extension_loaded('gd')) {
if (!dl('gd.so')) {
exit;
}
}
?>
Changelog
| Version | Description |
|---|---|
| 5.0.0 | extension_loaded() uses the internal extension name to test whether a certain extension is available or not. Most internal extension names are written in lower case but there may be extensions available which also use uppercase letters. Prior to PHP 5, this function compared the names case sensitively. |
See Also
- get_loaded_extensions() - Returns an array with the names of all modules compiled and loaded
- get_extension_funcs() - Returns an array with the names of the functions of a module
- phpinfo() - Outputs information about PHP's configuration
- dl() - Loads a PHP extension at runtime
- function_exists() - Return TRUE if the given function has been defined
- PHP Руководство
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- assert_options
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Коментарии
The explanation above renders this function useless.
I can check phpinfo() to determine the name of the extension.
If it's in the display that proves that it's loaded.
If not, I might know the dll name (php_printer.dll) but I don't know the name of the extension.