camelize + underscore in php

underscore.php

<?php
  /**
  * Transforms an under_scored_string to a camelCasedOne
  */
  function camelize($scored) {
    return preg_replace('/[-_]([a-z])/e', 'strtoupper("$1")', $scored);
  }

  /**
  * Transforms a camelCasedString to an under_scored_one
  */
  function underscore($cameled) {
      return preg_replace('/([a-z])([A-Z])/e', '"$1" . strtolower("_$2")', $cameled); 
  }