PHP에서 복잡한 표현식이 포함된 정적 변수를 올바르게 초기화하려면 어떻게 해야 합니까?

private static $dates = array(
  'start' => mktime( 0,  0,  0,  7, 30, 2009),  
  'end'   => mktime( 0,  0,  0,  8,  2, 2009),  
  'close' => mktime(23, 59, 59,  7, 20, 2009),  
  'early' => mktime( 0,  0,  0,  3, 19, 2009),  
);

Parse error: syntax error, unexpected '(', expecting ')' in /home/user/Sites/site/registration/inc/registration.class.inc on line 19

class Foo {
  static $bar;
}
Foo::$bar = array(…);

class Foo {
  private static $bar;
  static function init()
  {
    self::$bar = array(…);
  }
}
Foo::init();