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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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func_get_args上一级function_exists