array_mapFunnyPeculiarity.php

<?php

class Sanitizer
{
  public static function sanitizeString($str)
  {
    $str = stripSlashes($str);
    $str = htmlentities($str);
    return strip_tags($str);
  }

  public static function sanitizeArray($input)
  {
    return array_map(
      // Sanitizer::sanitizeString or self::sanitizeString don't work
      // but all these different ways would: 
      // array('Sanitizer','sanitizeString'),
      //'Sanitizer::sanitizeString',
      //array('self','sanitizeString'),
      'self::sanitizeString',
      $input
    );
  }
}