gistfile1.php

<?php

// Legacy Code
class Foo {
  public $some = 'thing';
  public $servers = array('server1', 'server2');
}

// Refactored Foo
class Bar {
  private $data = array(
    'some' => 'thing',
    'servers' => array('server1', 'server2'),
  );

  public function __get($var) {
    return $this->data[$var];
  }
}

$foo = new Foo();
echo print_r($foo->servers, true) . PHP_EOL;

$bar = new Bar();
echo print_r($bar->servers, true) . PHP_EOL;