update : 2015.11.03
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Returns the number of arguments passed to the function
Function handling 함수 목록
PHP Manual

func_num_args

(PHP 4, PHP 5, PHP 7)

func_num_args — Returns the number of arguments passed to the function

설명

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.

반환값

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

변경점

버전 설명
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.

오류/예외

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

예제

Example #1 func_num_args() example

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

foo(1, 2, 3);   
?>

위 예제의 출력:

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

주의

Note:

이 함수는 인수를 현재 영역(scope)에 의존하기 때문에, 함수의 인수로 사용할 수 없습니다. 이 값을 함수에 넘겨야 한다면, 결과값을 변수에 할당하여 그 변수로 넘겨야 합니다.

Function handling 함수 목록
PHP Manual