function_exists
register_shutdown_function
Function handling Functions
PHP Manual

# get_defined_functions

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

get_defined_functions — Returns an array of all defined functions

### Description

array get_defined_functions ( void )

Gets an array of all defined functions.

### Return Values

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).

### Examples

Example #1 get_defined_functions() example

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

The above example will output something 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
                ...
                [750] => bcscale
                [751] => bccomp
            )

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

    )

### See Also

- function_exists() - Return TRUE if the given function has been defined
- get_defined_vars() - Returns an array of all defined variables
- get_defined_constants() - Returns an associative array with the names of all the constants and their values
- get_declared_classes() - Returns an array with the name of the defined classes

function_exists
register_shutdown_function
Function handling Functions
PHP Manual