PHP Functions Essential Reference

extension_loaded

bool extension_loaded(string name) 

Checks for an extension.

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:

Check for GD support

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