确定调用该函数的名称空间 [英] Determine what namespace the function was called in

问题描述

我想知道是否可以确定调用函数时当前的名称空间是什么.我有此函数声明:

I was wondering if it was possible to determine what the current namespace was when the function was being called. I have this function declaration:

<?php
namespace Site\Action;
function add ($hook, $function) {
    /**
     * determine the namespace this was called from because
     * __NAMESPACE__ is "site\action" :(
     */
     if (is_callable($function))
         call_user_func($function);
}
?>

在另一个文件上:

<?php
namespace Foo;
function bar () {
}
?>

让我们说这是我的程序代码:

And let's say I have this as my procedural code:

<?php
namespace Foo;
Site\Action\add('hookname', 'bar');
?>

假设在这种情况下Bar旨在解析为Foo\bar是有道理的，因为这是从其调用的名称空间.

It would make sense to assume that Bar in this case was intended to resolve as Foo\bar since that was the namespace it was called from.

这是一个很长的解释，因此，是否可以确定调用Site\Action\add()的活动名称空间?

That was a long explanation so again, is it possible to determine the active namespace where Site\Action\add() was called from?

谢谢.

推荐答案

您正在寻找的是: debug_backtrace() a>是你的朋友.

What you are looking for is : ReflectionFunctionAbstract::getNamespaceName

If you want to know where you're coming from debug_backtrace() is your friend.

以下应解决您的难题:

function backtrace_namespace() 
{
    $trace = array();
    $functions = array_map(
        function ($v) {
            return $v['function'];
        },
        debug_backtrace()
    );
    foreach ($functions as $func) {
        $f = new ReflectionFunction($func);
        $trace[] = array(
            'function' => $func, 
            'namespace' =>  $f->getNamespaceName()
        );
    }
    return $trace;
}

只需从任何地方调用它即可查看回溯. 我修改了您的过程"代码文件，如下所示:

Just call it from anywhere to see the backtrace. I modified your "procedural" code file as follows:

namespace Foo;

function bar () 
{
    var_export(backtrace_namespace());
}

/** The unasked question: We need to use the fully qualified name currently. */
function go() 
{
    \Site\Action\add('hookname', 'Foo\\bar');
}

go();

包含此文件的结果将在stdout上显示如下:

The Result from including this file will be the following on stdout:

array (
    0 =>
    array (
        'function' => 'backtrace_namespace',
        'namespace' => '',
    ),
    1 =>
    array (
        'function' => 'Foo\\bar',
        'namespace' => 'Foo',
    ),
    2 =>
    array (
        'function' => 'call_user_func',
        'namespace' => '',
    ),
    3 =>
    array (
        'function' => 'Site\\Action\\add',
        'namespace' => 'Site\\Action',
    ),
    4 =>
    array (
        'function' => 'Foo\\go',
        'namespace' => 'Foo',
    ),
)

现在，奖励积分为隐藏的问题提供了答案:

Now for bonus points the answer to the hidden question:

以下内容将使您可以按预期的方式调用该函数:

The following will allow you to call the function as you intended:

 Site\Action\add('hookname', 'bar');

没有恐惧:

警告:call_user_func()期望参数1为有效的回调，找不到函数"bar"或无效的函数名称

Warning: call_user_func() expects parameter 1 to be a valid callback, function 'bar' not found or invalid function name

因此，在重新设计尺寸之前，请尝试以下尺寸:

So before you redesign try this on for size:

namespace Site\Action;

function add($hook, $function) 
{
    $trace = backtrace_namespace();
    $prev = (object) end($trace);

    $function = "$prev->namespace\\$function";

    if (is_callable($function))
        call_user_func($function);
}

我看不出为什么不应该使用debug_backtrace的原因，这就是它的用途.

I see no reason why debug_backtrace should not be used, this is what it is there for.

nJoy！

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