gistfile1.php

<?php

class hoge
{
    public static $fuga = 'tetete';

    public function __construct() { self::$fuga = 'tatata'; }
    public function hohoho() { return self::$fuga; }
    public static function hehehe() { return self::$fuga; }
}

var_dump(hoge::$fuga); // string(6) "tetete"
var_dump(hoge::hehehe()); // string(6) "tetete"

$hoge = new hoge();
var_dump($hoge->hohoho()); // string(6) "tatata"
var_dump(hoge::hehehe()); // string(6) "tatata"