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extension_loaded

Name

extension_loaded — Checks for an extension.

Synopsis

bool extension_loaded(name); string name: Name of extension to check for

Returns

TRUE if extension is loaded; FALSE on error

Description

Checks whether an extension is loaded into PHP. This can be useful in more complex scripts in which functionality depends on an extension being present. For example, a graphing class can check for the existence of the GD library before any other action is taken and produce a friendly error if no GD support is available, or try to load the extension itself.

Version

Existing since version 3.0.10

Example

Example 992. Check for GD support

<?php
if (extension_loaded("gd")) {
   echo "Extension found";
} else {
   echo "Extension not found. Attempting load";
   dl("php_gd.dll");
}
?>

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.