PHP：等效于字符串表示的类名的 instanceof
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PHP: instanceof equivalent for a string-represented classname
提问by shealtiel
It's best to explain by an example. I look for a function "theFunctionILookFor" that will make the code work.
最好通过一个例子来解释。我寻找一个函数“theFunctionILookFor”来使代码工作。
$myClassName = "someName";
$parentOrInterfaceName = "someParent";
if ( theFunctionILookFor ($myClassName)) echo "is parrent";
edit: I try to avoid instantiating the class just to perform this check. I would like to be able to pass 2 string parameters to the checking function
编辑：我尽量避免实例化类只是为了执行此检查。我希望能够将 2 个字符串参数传递给检查函数
回答by shealtiel
Looks like this is my answer: is_subclass_of
看起来这是我的答案： is_subclass_of
It can accept both parameters as strings
它可以接受两个参数作为字符串
回答by Unsigned
Try is_subclass_of(). It can accept both parameters as strings. http://php.net/manual/en/function.is-subclass-of.php
试试is_subclass_of()。它可以接受两个参数作为字符串。http://php.net/manual/en/function.is-subclass-of.php
回答by Kmtdk
I think that instanceofis a lot faster and more clear to read.
我认为instanceof阅读起来更快，更清晰。
instanceofdoes not work on strings, because it can be used as a "identifier" for a class:
instanceof不适用于字符串，因为它可以用作类的“标识符”：
$temp = 'tester';
$object = new sub();
var_dump($object instanceof $temp); //prints "true" on php 5.3.8
class tester{}
class sub extends \tester{
}
Also, it works on interfaces - you just need a variable to contain the absolute class name (including namespace, if you want to be 100% sure).
此外，它适用于接口 - 您只需要一个变量来包含绝对类名（包括命名空间，如果您想 100% 确定）。
回答by Oswald
Using the Reflection API, you can construct a ReflectionClass objectusing the name of the class as well as an object.
使用Reflection API，您可以使用类名和对象来构造一个 ReflectionClass对象。
回答by Nanne
You might use this?
你可能会用这个？
http://www.php.net/manual/en/function.get-parent-class.php
http://www.php.net/manual/en/function.get-parent-class.php
From the page:
从页面：
get_parent_class
(PHP 4, PHP 5, PHP 7)
get_parent_class — Retrieves the parent class name for object or classDescription
string get_parent_class ([ mixed $object ] )Retrieves the parent class name for object or class.
get_parent_class
(PHP 4, PHP 5, PHP 7)
get_parent_class — 检索对象或类的父类名描述
string get_parent_class ([ mixed $object ] )检索对象或类的父类名称。
回答by TCB13
This is an old thread, but still for future reference, you can use the functions is_aand is_subclass_ofto accomplish this in a more efficient way.
No need to instantiate anything, you can just pass your string like:
这是一个旧线程，但仍供将来参考，您可以使用这些函数is_a并is_subclass_of以更有效的方式完成此操作。无需实例化任何东西，您只需传递您的字符串，例如：
if (is_subclass_of($myObject, 'SomeClass')) // is_a(...)
echo "yes, $myObject is a subclass of SomeClass\n";
else
echo "no, $myObject is not a subclass of SomeClass\n";
PHP Docs:
PHP 文档：
http://www.php.net/manual/en/function.is-a.php
http://www.php.net/manual/en/function.is-subclass-of.php
