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Date: Mon, 3 Oct 2011 13:26:04 -0700
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To: PHP Developers Mailing List <internals@lists.php.net>
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Subject: Bug with static property access
From: chrisstocktonaz@gmail.com (Chris Stockton)

Hello,

I noticed the following odd behavior earlier today, there is
definitely a bug here in my opinion, the bug is either the error
message or the behavior. I think the behavior is possibly expected.
I'll let some others comment.

The reason I think the error is odd is because it is very misleading
in a much larger code base (what I was debugging) you go to the line
it is complaining about and are perplexed because you are not
attempting to access the mentioned constant. I'm sure the engine does
some kind of lazy/runtime determination that causes this, that area
may need a look at?

Example:
<?php
abstract class ClassA {
  static protected $_cache = Array();

  public $version = self::VERSION;

  final static public function MethodOne() {
    return __METHOD__;
  }

  final static public function MethodTwo() {
    self::$_cache;
    return __METHOD__;
  }
}

abstract class ClassB extends ClassA {
  const VERSION = 1;
}

var_dump(ClassB::MethodOne());
var_dump(ClassB::MethodTwo());

?>

// prints
string(17) "ClassA::MethodOne"
Fatal error: Undefined class constant 'self::VERSION' in
<SNIP>/testbug.php on line 14