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<?php class Car { private $speed = 0; public function getSpeed() { return $this->speed; } protected function speedUp() { $this->speed += 10; } //增加start方法，使他能夠調(diào)用受保護(hù)的方法speedUp實(shí)現(xiàn)加速10 public function start() { //訪問函數(shù)也需要$this來調(diào)用 同c+