Default values for passing an array in to a PHP function

gistfile1.php[345]

<?php

function example($params = array()) {
  $defaults = array(
    "one"   => 1,
    "two"   => 2,
    "three" => 3);
  
  $params = array_merge($defaults, $params);
  return $params;
}

print_r(example(array("two" => 4)));
/*
OUTPUT:

  Array
  (
    [one] => 1
    [two] => 4
    [three] => 3
  )

*/

?>