PHP func_num_args() Function

The func_num_args() function is an inbuilt function in PHP that returns the number of arguments in the user-defined function.

Syntax:

func_num_args(): int

Parameters: This function doesn’t accept any parameter.

Return Values: The number of arguments will be returned into the current user-defined function.

Errors: It will generate errors if called from outside of the function.

Example 1: This code demonstrates the func_num_args() function.

PHP

<?php

function sum() {
    echo "Arguments in sum function = ", func_num_args();
}

sum(1, 2, 3, 4);

?>

Output:

Arguments in sum function = 4  

Example 2: The following code demonstrates the func_num_args() function.

PHP

<?php

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

    $arg_list = func_get_args();
    for ($i = 0; $i < $numargs; $i++) {
        echo "Argument $i is: " . $arg_list[$i] . "\n";
    }
}

foo(1, 2, 3);

?>

Output:

Number of arguments: 3 
Argument 0 is: 1
Argument 1 is: 2
Argument 2 is: 3 

Reference: https://www.php.net/manual/en/function.func-num-args.php