class?studeng
{
????public?static?$a?=?0;
????public??function?bb()
????{
????????self::$a;
????????return?self::$a++;
????????
????}
}
//$studeng?=?new?studeng();
//echo?$studeng->bb();
echo?studeng::bb()."<br>";
echo?studeng::bb()."<br>";
echo?studeng::bb()."<br>";
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