extension_loaded

    (PHP 4, PHP 5, PHP 7, PHP 8)

    extension_loaded — Find out whether an extension is loaded

    Description

    extension_loaded(string$extension): bool

    Finds out whether the extension is loaded.

    Parameters

    extension

    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]

    Return Values

    Returns true if the extension identified by extension is loaded, false otherwise.

    Examples

    Example #1 extension_loaded() example

    <?php
    if (!extension_loaded('gd')) {
    if (!    dl('gd.so')) {
    exit;
    }
    }
    ?>

    See Also

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