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如果在
class Truck extends Car{ public function speedUp(){ $this->speed=parent::speedUp()+50; return $this->speed; } }
加return和不加有什么区别？？
When is return used? -PHP Chinese website Q&A-When is return used? -PHP Chinese website Q&A
Please watch and learn.
如果在一个函数中调用 return 语句，将立即结束此函数的执行并将它的参数作为函数的值返回，如果去掉return这句，次方法将会没有返回值。
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
When is return used? -PHP Chinese website Q&A-When is return used? -PHP Chinese website Q&A
Please watch and learn.
如果在一个函数中调用 return 语句，将立即结束此函数的执行并将它的参数作为函数的值返回，如果去掉return这句，次方法将会没有返回值。