(PHP 4, PHP 5, PHP 7)
extension_loaded — Find out whether an extension is loaded
$name
) : boolFinds out whether the extension is loaded.
nameThe 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]
Returns TRUE if the extension identified by name
is loaded, FALSE otherwise.
Example #1 extension_loaded() example
<?php
if (!extension_loaded('gd')) {
if (!dl('gd.so')) {
exit;
}
}
?>