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# func_num_args

(PHP 4, PHP 5)

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

## 说明

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.

## 返回值

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

## 错误／异常

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

## 范例

例 1. func_num_args() example

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

## 注释

> 注意: Because this function depends on the current scope to determine parameter details, it cannot be used as a function parameter. If you must pass this value, assign the results to a variable, and pass the variable.

## 参见

func_get_arg()
func_get_args()

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