[UPHPU] Child class references static variable of parent instead of its own

[Richard K Miller]

Here's an OOP question that perplexes me. It seems PHP doesn't treat  
static variables correctly in child classes.

<?php
	class ABC {
		public $regular_variable = "Regular variable in ABC\n";
		public static $static_variable = "Static variable in ABC\n";
	
		public function regular_function() {
			echo $this->regular_variable;
		}
		
		public static function static_function() {
			echo self::$static_variable;
		}
	}

	class DEF extends ABC {
		public $regular_variable = "Regular variable in DEF\n";
		public static $static_variable = "Static variable in DEF\n";
	}

	$abc = new ABC();
	$abc->regular_function();
	ABC::static_function();

	$def = new DEF();
	$def->regular_function();
	DEF::static_function();
?>

WHAT I EXPECTED:
Regular variable in ABC
Static variable in ABC
Regular variable in DEF
Static variable in DEF

ACTUAL OUTPUT:
Regular variable in ABC
Static variable in ABC
Regular variable in DEF
Static variable in ABC <--- This is different from what I expected

Anyone know why?

Richard