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

Example#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

Note: 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()


	PHP5中文手册 func_get_args function_exists Function handling PHP Manual 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 Example#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 Note: 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() func_get_args function_exists Function handling PHP Manual