$sql = "insert into user(name, age, class) values('{$name}', '{$age}', '{$class}')";
mysql_query($sql);
$sql="select id from user";
<?php
class Car {
public $speed = 0;
//增加speedUp方法，使speed加10
public function speedUp(){
$this->speed +=10; //+= 是缩写 也可以写成这样 $this->speed = $this->speed + 10;
}
}
$car = new Car();
$car->speedUp();
echo $car->speed;
