Optional parameters in PHP

optional_parameters.php

<?php
function foo() {

  $numargs = func_num_args();
  echo "Number of arguments: $numargs<br />\n";

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

  $arg_list = func_get_args();

  for ($i = 0; $i < $numargs; $i++) {
      echo "Argument $i is: " . $arg_list[$i] . "<br />\n";
  }
}