如何检查symfony2中是否有类的实例

I want to execute some functions if entity is member of few classes but not some.

如果实体是少数类的成员，而不是某些类，那么我想执行一些函数。

There is a function called instanceof.

有一个函数叫instanceof。

But is there something like

但是否有类似的东西。

if ($entity !instanceof [User,Order,Product])

5 个解决方案

#1

Give them a common interface and then

给他们一个通用接口。

if (!$entity instanceof ShopEntity)

or stay with

或者留在

if (!$entity instanceof User && !$entity instanceof Product && !$entity instanceof Order)

I would avoid creating arbitrary functions just to save some characters at a single place. On the other side if you need it "too often", you may have a design flaw? (In the meaning of "too much edge cases" or such)

我将避免创建任意函数，只是为了在一个地方保存一些字符。另一方面，如果你“经常”需要它，你可能有设计缺陷?(“太多边缘情况”的意思)

#2

PHP manual says: http://php.net/manual/en/language.operators.type.php

PHP手册说:http://php.net/manual/en/language.operators.type.php

!($a instanceof stdClass)

This is just a logical and "grammatically" correct written syntax.

这只是一种逻辑上和语法上正确的书写语法。

The above suggested syntax though, is tricky because we are not specifying which exactly is the scope of the negation: the variable itself or the whole construct of "$var instanceof someclass". We will only have to rely here on the operator precendence [Edited, thanks to @Kolyunya].

上面提到的语法很棘手，因为我们没有指定否定的范围:变量本身或“$var instanceof someclass”的整个构造。在这里，我们只需要依靠运营商的优势[经过编辑，感谢@Kolyunya]。

!$class instanceof someClass

#3

PHP Operator Precedence

PHP运算符优先级

instanceof operator is just before negation then this expression:

实例运算符是在否定之前，那么这个表达式是:

!$class instanceof someClass

is just right in PHP and this do that you expect.

在PHP中是正确的，这是你所期望的。

#4

This function should do it:

这个函数应该这样做:

function isInstanceOf($object, Array $classnames) {
    foreach($classnames as $classname) {
        if($object instanceof $classname){
            return true;
        }
    }
    return false;
}

So your code is

所以你的代码是

if (!isInstanceOf($entity, array('User','Order','Product')));

#5

function check($object) {
    $deciedClasses = [
        'UserNameSpace\User',
        'OrderNameSpace\Order',
        'ProductNameSpace\Product',
    ];

    return (!in_array(get_class($object), $allowedClasses));
}

#1