Get Extension Functions in PHP

PHP offers support for extensions, allowing developers to leverage additional functionality beyond the core language. Sometimes, you may want to inspect or interact with a specific extension to understand its available functions. This can be particularly useful for debugging or dynamically determining what you can do with an extension. This tutorial demonstrates how to get extension functions in PHP.

The get_extension_funcs function takes the name of a PHP extension as its argument and returns an array of the functions provided by that extension. If the extension is not loaded or does not exist, the function will return false.

Here's a simple PHP script to demonstrate how to retrieve and print the list of functions for the GD extension:

<?php

$funcs = get_extension_funcs('gd');
print_r($funcs);

If the GD extension is installed and enabled, the script will output an array of functions provided by the extension, similar to the following:

Array
(
    [0] => gd_info
    [1] => imageloadfont
    [2] => imagesetstyle
    [3] => imagecreatetruecolor
    [4] => imageistruecolor
    ...
    [106] => imagesetinterpolation
    [107] => imageresolution
)