动态获取PHP类名称空间 [英] Get PHP class namespace dynamically

问题描述

如何自动检索类名称空间?

How can I retrieve a class namespace automatically?

魔术变量__NAMESPACE__不可靠，因为在子类中定义不正确.

The magic var __NAMESPACE__ is unreliable since in subclasses it's not correctly defined.

示例:

class Foo\bar\A-> __NAMESPACE__ === Foo \ bar

class Foo\bar\A -> __NAMESPACE__ === Foo\bar

class Ping\pong\B extends Foo\bar\A-> __NAMESPACE__ === Foo \ bar(应该是Ping \ pong)

class Ping\pong\B extends Foo\bar\A -> __NAMESPACE__ === Foo\bar (it should be Ping\pong)

ps:我注意到使用__CLASS__时出现了相同的错误行为，但是我使用get_called_class()解决了...是否存在类似get_called_class_namespace()的问题?如何实现这种功能?

ps: I noticed the same wrong behavior using __CLASS__, but I solved using get_called_class()... is there something like get_called_class_namespace()? How can I implement such function?

更新:
我认为解决方案是我自己的问题，因为我意识到get_called_class()返回完全限定的类名，因此我可以从中提取名称空间:D ...无论如何，如果有更有效的方法，请告诉我；)

UPDATE:
I think the solution is in my own question, since I realized get_called_class() returns the fully qualified class name and thus I can extract the namespace from it :D ...Anyway if there is a more effective approach let me know ;)

推荐答案

class Foo\Bar\A的命名空间为Foo\Bar，因此__NAMESPACE__运行良好.您正在寻找的可能是以命名空间分隔的类名，只需加入echo __NAMESPACE__ . '\\' . __CLASS__;即可轻松获得.

The namespace of class Foo\Bar\A is Foo\Bar, so the __NAMESPACE__ is working very well. What you are looking for is probably namespaced classname that you could easily get by joining echo __NAMESPACE__ . '\\' . __CLASS__;.

考虑下一个示例:

namespace Foo\Bar\FooBar;

use Ping\Pong\HongKong;

class A extends HongKong\B {

    function __construct() {
        echo __NAMESPACE__;
    }
}

new A;

将打印出Foo\Bar\FooBar这是非常正确的...

Will print out Foo\Bar\FooBar which is very correct...

即使您这样做

namespace Ping\Pong\HongKong;

use Foo\Bar\FooBar;

class B extends FooBar\A {

    function __construct() {
        new A;
    }
}

它将回显Foo\Bar\FooBar，这又是非常正确的...

it will echo Foo\Bar\FooBar, which again is very correct...

编辑:如果您需要在嵌套类的主类中获取嵌套类的名称空间，只需使用:

If you need to get the namespace of the nested class within the main that is nesting it, simply use:

namespace Ping\Pong\HongKong;

use Foo\Bar\FooBar;

class B extends FooBar\A {

    function __construct() {
        $a = new A;
        echo $a_ns = substr(get_class($a), 0, strrpos(get_class($a), '\\'));
    }
}

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