php__phplib/misc/attributes.php

<?php
class Foo {
  private static $hash;

  protected static function ensure_hash() {
    if (!isset(self::$hash)) {
      self::$hash = spl_object_hash(self);
      echo "Set hash to " . print_r(self::$hash, TRUE) . "\n";
    }
  }

  protected static function ensure_key($name) {
    $key = self::hash . '_' . $name;
    if (!property_exists(__CLASS__, $key)) {
      self::${$key} = NULL;
    }
  }

  public static function attr_reader() {
    $args = func_get_args();
    if (!empty($args)) {
      self::ensure_hash();
      foreach ($args as $name) {
        self::ensure_key($name);
      }
    }
  }

  public function attr_writer() {

  }

  public function attr_accessor() {

  }
}