PHP 手冊
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# func_num_args

(PHP 4 , PHP 5)

func_num_args -- Returns the number of arguments passed to the function

## Description

int func_num_args ( void )

Returns the number of arguments passed into the current user-defined function. func_num_args() will generate a warning if called from outside of a user-defined function. This function cannot be used directly as a function parameter. Instead, its result may be assigned to a variable, which can then be passed to the function.

`<?php function foo() { $numargs = func_num_args(); echo "Number of arguments: $numargs\n"; } foo(1, 2, 3); // Prints 'Number of arguments: 3' ?>`

func_num_args() 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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