<?php

    class Foo
    {
        protected static $bar = 'lorem';
        protected $buz = 'ipsum';

        public function test()
        {
            var_dump( $this->buz );
            var_dump( self::$bar );
        }

    }


    $instance = new Foo;
    $instance->test();

?>

string(5) "ipsum"
string(5) "lorem"