get_defined_functions()

get_defined_functions() — Returns an array of all defined functions.

Built-in function of PHP 8.5. The manual lists it as available in PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

Signature

get_defined_functions(bool $exclude_disabled = true): array

Parameters

Parameter	Type	What it takes
$exclude_disabled	bool	Whether disabled functions should be excluded from the return value. This parameter has no effect since PHP 8.0.0.

Return value

Returns a multidimensional array containing a list of all defined functions, both built-in (internal) and user-defined. The internal functions will be accessible via $arr["internal"], and the user defined ones using $arr["user"] (see example below).

Example

A runnable snippet:

function myrow($id, $data) { return "<tr><th>$id</th><td>$data</td></tr>\n"; } $arr = get_defined_functions(); print_r($arr);

Output:

Array ( [internal] => Array ( [0] => zend_version [1] => func_num_args [2] => func_get_arg [3] => func_get_args [4] => strlen [5] => strcmp [6] => strncmp ... [750] => bcscale [751] => bccomp ) [user] => Array ( [0] => myrow ) )

Changelog

Version	Change
8.5.0	The exclude_disabled parameter has been deprecated, as it no longer has any effect.
8.0.0	The default value of the exclude_disabled parameter has been changed from false to true. However, it will not have any effect as disabled functions are removed from the function table at compile time.
7.0.15, 7.1.1	The exclude_disabled parameter has been added.