PHP Functions Essential Reference

func_num_args

int func_num_args(void) 

Gets the number of arguments passed to a function.

Returns:

The number of arguments passed to a user function; -1 if func_num_args() is called in global scope

Description:

func_num_args() returns the number of arguments that have been passed to a user-defined function. It’s most often used in conjunction with func_get_arg() and func_get_args() to ensure that the right number of arguments have been passed to a function.

Availability:

UNIX, Windows

Version:

4.0b4+

See also:

func_get_arg() 
func_get_args() 

Examples:

Demonstrate how func_num_args() works

<pre> <?php function demo () { $num_args = func_num_args(); print "The function was passed $num_args argument(s).\n"; } demo (); demo ('A single argument'); ...