PHP静态延迟绑定和普通静态效率的对比

class A { 
  protected static $1 = array('a1', 'b', 'c', 'd'); 
  protected static $2 = array('a2', 'b', 'c', 'd'); 
  protected static $3 = array('a3', 'b', 'c', 'd'); 
  protected static $4 = array('a4', 'b', 'c', 'd'); 
  protected static $5 = array('a5', 'b', 'c', 'd'); 
 
  public static function n1() { 
    return static::$1; 
  } 
  public static function n2() { 
    return static::$2; 
  } 
  public static function n3() { 
    return static::$3; 
  } 
  public static function n4() { 
    return static::$4; 
  } 
  public static function n5() { 
    return static::$5; 
  } 
} 
 
class C extends A { 
 
} 
 
class B { 
  protected static $1 = array('a1', 'b', 'c', 'd'); 
  protected static $2 = array('a2', 'b', 'c', 'd'); 
  protected static $3 = array('a3', 'b', 'c', 'd'); 
  protected static $4 = array('a4', 'b', 'c', 'd'); 
  protected static $5 = array('a5', 'b', 'c', 'd'); 
 
  public static function n1() { 
    return self::$1; 
  } 
  public static function n2() { 
    return self::$2; 
  } 
  public static function n3() { 
    return self::$3; 
  } 
  public static function n4() { 
    return self::$4; 
  } 
  public static function n5() { 
    return self::$5; 
  } 
}