forward_static_call
func_get_args
Function handling Functions
PHP Manual

# func_get_arg

(PHP 4, PHP 5)

func_get_arg — Return an item from the argument list

### Description

mixed func_get_arg ( int `$arg_num` )

Gets the specified argument from a user-defined function's argument list.

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

### Parameters

`arg_num`

  The argument offset. Function arguments are counted starting from zero.

### Return Values

Returns the specified argument, or `FALSE` on error.

### 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 `FALSE`.

### Errors/Exceptions

Generates a warning if called from outside of a user-defined function, or if `arg_num` is greater than the number of arguments actually passed.

### Examples

Example #1 func_get_arg() example

`<?php
function foo()
{
$numargs = func_num_args();
echo "Number of arguments: $numargs\n";
if ($numargs >= 2) {
echo "Second argument is: " . func_get_arg(1) . "\n";
}
}
foo(1, 2, 3);
?>`

The above example will output:

    Number of arguments: 3
    Second argument is: 2

Example #2 func_get_arg() example before and after PHP 5.3

`test.php
<?php
function foo() {
include './fga.inc';
}
foo('First arg', 'Second arg');
?>
fga.inc
<?php
$arg = func_get_arg(1);
var_export($arg);
?>`

Output previous to PHP 5.3:

    'Second arg'

Output in PHP 5.3 and later:

    Warning: func_get_arg():  Called from the global scope - no function
    context in /home/torben/Desktop/code/ml/fga.inc on line 3
    false

Example #3 func_get_arg() example of byref and byval arguments

`<?php
function byVal($arg) {
echo 'As passed : ', var_export(func_get_arg(0)), PHP_EOL;
$arg = 'baz';
echo 'After change : ', var_export(func_get_arg(0)), PHP_EOL;
}
function byRef(&$arg) {
echo 'As passed : ', var_export(func_get_arg(0)), PHP_EOL;
$arg = 'baz';
echo 'After change : ', var_export(func_get_arg(0)), PHP_EOL;
}
$arg = 'bar';
byVal($arg);
byRef($arg);
?>`

The above example will output:

As passed : 'bar'
After change : 'bar'
As passed : 'bar'
After change : 'baz'

### 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.

> Note:

> If the arguments are passed by reference, any changes to the arguments will be reflected in the values returned by this function.

> Note: This function returns a copy of the passed arguments only, and does not account for default (non-passed) arguments.

### See Also

- ... syntax in PHP 5.6+
- func_get_args()
- func_num_args()

forward_static_call
func_get_args
Function handling Functions
PHP Manual