How to get static data member from php object instance? [closed]

by

E.g. via 

<?php
class Foo {
    public function bar() {
        echo '-> '. self::$data . ' <-';
    }

    public static $data="FooData";
}

$foo = new Foo;
$foo->bar();

see also: http://php.net/language.oop5.late-static-bindings

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