(PHP 4, PHP 5, PHP 7, PHP 8)
extension_loaded — Find out whether an extension is loaded
extensionThe extension name. This parameter is case-insensitive.
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]
Example #1 extension_loaded() example
<?php
if (!extension_loaded('gd')) {
if (!dl('gd.so')) {
exit;
}
}
?>