func_get_args
function_exists
Function handling Functions
PHP Manual

# func_num_args

(PHP 4, PHP 5)

func_num_args — Returns the number of arguments passed to the function

### Description

int func_num_args ( void )

Gets the number of arguments passed to the function.

This function may be used in conjunction with func_get_arg() and func_get_args() to allow user-defined functions to accept variable-length argument lists.

### Return Values

Returns the number of arguments passed into the current user-defined function.

### Changelog

Version | Description
--- | ---
5.3.0 | This function can now be used in parameter lists.

### Errors/Exceptions

Generates a warning if called from outside of a user-defined function.

### Examples

Example #1 func_num_args() example

`<?php
function foo()
{
$numargs = func_num_args();
echo "Number of arguments: $numargs\n";
}
foo(1, 2, 3); // Prints 'Number of arguments: 3'
?>`

### Notes

> Note: Because this function depends on the current scope to determine parameter details, it cannot be used as a function parameter. If this value must be passed, the results should be assigned to a variable, and that variable should be passed.

### See Also

- func_get_arg()
- func_get_args()

func_get_args
function_exists
Function handling Functions
PHP Manual