php的类型运算符instanceof(用于确定一个 PHP 变量是否属于某一类 class 的实例)

class Test{
    public function Test($c)
    {
        echo "1111";
        if($c instanceof Closure)
        {
            echo "传的是闭包类";
        }else{
            echo "传的不是闭包类";
        }

    }

}


$t = new Test(function (){
    return 1;
});

class Test{
    public function Test(Closure $c)
    {
        echo "1111";
        if($c instanceof Closure)
        {
            echo "传的是闭包类";
        }else{
            echo "传的不是闭包类";
        }

    }

}