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func_num_args

(PHP 4, PHP 5, PHP 7)

func_num_argsReturns the number of arguments passed to the function

Description

func_num_args ( void ) : int

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.

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Return Values

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

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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.

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Errors/Exceptions

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

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Examples

Example #1 func_num_args() example

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

foo(123);   
?>

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

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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.

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-function.func-num-args.html

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References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

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