PHP func_num_args() Function

The PHP func_num_args() function returns 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.

Syntax

func_num_args()

Parameters

No parameter is required.

Return Value

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

Exceptions

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

Example: func_num_args() example

The example below shows the usage of func_num_args() function.

<?php
function myFunction() {
  //getting the number of arguments passed
  $numargs = func_num_args();
  echo "Number of arguments: $numargs\n";

  //displaying the second argument
  if ($numargs >= 2) {
    echo "Second argument is: ".func_get_arg(1)."\n";
  }

  //displaying the array containing 
  //function's argument list
  print_r(func_get_args());
}

myFunction(10, 20, 30);
?>

The output of the above code will be:

Number of arguments: 3
Second argument is: 20
Array
(
    [0] => 10
    [1] => 20
    [2] => 30
)