func_get_args
function_exists
Function handling Functions
PHP Manual

# 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.
5.3.0 | If this function is called from the outermost scope of a file which has been included by calling include or require from within a function in the calling file, it now generates a warning and returns -1.

### 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);
?>`

The above example will output:

    Number of arguments: 3

Example #2 func_num_args example before and after PHP 5.3

`test.php
<?php
function foo() {
include './fna.php';
}
foo('First arg', 'Second arg');
?>
fna.php
<?php
$num_args = func_num_args();
var_export($num_args);
?>`

Output previous to PHP 5.3:

    2

Output in PHP 5.3 and later will be something similar to:

    Warning: func_num_args():  Called from the global scope - no function
    context in /home/torben/Desktop/code/ml/fna.php on line 3
    -1

### Notes

> Note:

> Because this function depends on the current scope to determine parameter details, it cannot be used as a function parameter in versions prior to 5.3.0. 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
- ReflectionFunctionAbstract::getNumberOfParameters