func_num_args

Returns the number of arguments passed to the function

&reftitle.description; `int` `func_num_args`

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.

&reftitle.returnvalues;

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

&reftitle.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.

&reftitle.errors;

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

&reftitle.examples;

### `func_num_args` example

    <?php
    function foo()
    {
        $numargs = func_num_args();
        echo "Number of arguments: $numargs\n";
    }

    foo(1, 2, 3);
    ?>

&example.outputs;

    Number of arguments: 3

### `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

&reftitle.notes; ¬e.funcnoparam;
&reftitle.seealso;

- `func_get_arg`
- `func_get_args`
- `ReflectionFunctionAbstract::getNumberOfParameters`