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# extension_loaded

(PHP 3 >= 3.0.10, PHP 4, PHP 5)

extension_loaded -- Find out whether an extension is loaded

## Description

bool extension_loaded ( string name )

Returns `TRUE` if the extension identified by name is loaded, `FALSE` otherwise.

範例 1. extension_loaded() example

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

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]

> 注: 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 extension available which also use uppercase letters. Be warned that this function compares case sensitive !

See also get_loaded_extensions(), get_extension_funcs(), phpinfo(), and dl().

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