我试图如下声明变量:
class GumballMachine {
private static $SOLD_OUT = 0;
private $state = $SOLD_OUT;
private function GumballMachine (){}
}
如何将$SOLD_OUT的值分配给$state,或者有其他方法吗?
您可以使用类常量来完成此操作
const SOLD_OUT = 0;
private $state = self::SOLD_OUT;
`class GumballMachine {
private static $SOLD_OUT = 0;
private $state = 0;
private function GumballMachine ()
{
$this->state=$SOLD_OUT;
}
}`
您需要使用一个常数值。此外,您需要将构造函数声明为公共构造函数,否则将遇到错误。
class GumballMachine {
const SOLD_OUT = 0;
private $state = self::SOLD_OUT;
public function GumballMachine () { }
}