Type hinting discussion and contracts

In the recently ongoing type-hints discussion on the PHP internals mailinglist (see also the PHP Wiki), an interesting proposal was made. It suggests using functions to verify argument types instead of introducing a type checking mechanism which is not strict enough for some, not flexible enough for others and too magic for yet another group.

<?php 
  function array_of_numeric($x) {
    foreach ($x as $val) {
      if (!is_numeric($val)) return FALSE;
    }
    return TRUE;
  }
  
  class Arrays {
    public static function sum(array_of_numeric $a) {
      return array_sum($a);
    }
  }
?>

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