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(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.

Related Function(s)

func_get_arg()

func_get_args()