PHP get_defined_functions() Function

The PHP get_defined_functions() function is used to get an array of all defined functions.

Syntax

get_defined_functions(exclude_disabled)

Parameters

exclude_disabled Optional. Specify whether the disabled functions should be excluded from the return value or not. Default is true.

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"].

Example: get_defined_functions() example

The example below shows the usage of get_defined_functions() function.

<?php
function myFunction() {
  //codes
}

//getting an array of all defined functions
$arr = get_defined_functions();

//displaying the result
print_r($arr)
?>

The output of the above code will be similar to:

Array
(
    [internal] => Array
        (
            [0] => zend_version
            [1] => func_num_args
            [2] => func_get_arg
            [3] => func_get_args
            [4] => strlen
            [5] => strcmp
            [6] => strncmp
            ...
            [1267] => opcache_is_script_cached
            [1268] => dl
            [1269] => cli_set_process_title
            [1270] => cli_get_process_title
        )

    [user] => Array
        (
            [0] => myfunction
        )

)

Example: getting the list of all user-defined functions

Consider one more example where this function is used to get the list of all user-defined functions.

<?php
function myFunction1() {
  //codes
}

function myFunction2() {
  //codes
}

function myFunction3() {
  //codes
}

//getting an array of all defined functions
$arr = get_defined_functions();

//displaying the list of 
//all user-defined functions
print_r($arr["user"])
?>

The output of the above code will be:

Array
(
    [0] => myfunction1
    [1] => myfunction2
    [2] => myfunction3
)

❮ PHP Function Handling Reference