Description:
------------
Can you update the strings document to explain why you cannot use self::$var in any string, or if you can what php version it works in.

I do not know if this is a bug, or if it is my php version, but I can't understand why I can access the var and echo it out yet when I put it in a string using escaped methods it is ignored and throws a notice saying undefined when it clearly is!

Thanks

Dan

Reproduce code:
---------------
class user {
	
	private static $table = "foo";
	
	public function user() {
	
		//blah...
	
	}
	
	public static function test() {
	
		$str = "table = ". self::$table . "<br/>";
		echo $str;
		// Outputs: table = foo
		$str = "table = {self::$table} <br/>";
		echo $str;
		// Outputs: 
		// Notice: Undefined variable: table in /*** on line ***
		$str = '{self::$table}' . "<br/>";
		echo $str;
		// Outputs: table = {self::}
		$str = <<<EOD
		table = self::$table
EOD;
		/* 
		Outputs: 
		Notice: Undefined variable: table in /*** on line ***
		table = self::
		*/
		echo $str;	
	}
	
}

Expected result:
----------------
table = foo
table = foo
table = {self::$table} 
table = foo

Actual result:
--------------
table = foo 
Notice: Undefined variable: table in /*** on line ***
table = {self::} 
table = {self::$table} // correct!
Notice: Undefined variable: table in /*** on line ***
table = self::