echo "ftest"; } public function run() { echo "***"; $this->ftest(); } public static function stest() { echo "static in AAA"; } public static function srun() { echo "%%%"; static::stest(); } } class BBB extends AAA { public function ftest() { echo "hello ,abc"; } public static function stest() { echo "static in BBB"; } } $a = new BBB(); $a->run(); $a::srun();