(PHP 4, PHP 5, PHP 7)
extension_loaded — Find out whether an extension is loaded
extension_loaded ( string $name ) : bool
Finds out whether the extension is loaded.
name
The 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; } } ?>
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https://www.php.net/manual/en/function.extension-loaded.php