是否有可能获得已定义名称空间的列表 [英] is it possible to get list of defined namespaces

问题描述

我想知道php 5.3+中是否有一种方法来获取应用程序中已定义名称空间的列表.

I was wondering if there is a way in php 5.3+ to get a list of defined namespaces within an application. so

如果 file 1 has namespace FOO 和 file 2 has namespace BAR

if file 1 has namespace FOO and file 2 has namespace BAR

现在，如果我在文件3 id中包含文件1和文件2，则想通过某种函数调用知道名称空间FOO和BAR已加载.

Now if i include file 1 and file 2 in file 3 id like to know with some sort of function call that namespace FOO and BAR are loaded.

我想实现这一点，以确保在检查类是否存在之前(使用is_callable)，确保已加载应用程序中的模块.

I want to achieve this to be sure an module in my application is loaded before checking if the class exists ( with is_callable ).

如果这不可能，我想知道是否有一个函数来检查是否定义了特定的名称空间，例如is_namespace().

If this is not possible i'd like to know if there is a function to check if a specific namespace is defined, something like is_namespace().

希望您能明白.以及我要实现的目标

Hope you get the idea. and what i'm trying to achieve

推荐答案

首先，使用

Firstly, to see if a class exists, used class_exists.

第二，您可以使用

Secondly, you can get a list of classes with namespace using get_declared_classes.

在最简单的情况下，可以使用它从所有已声明的类名称中找到匹配的名称空间:

In the simplest case, you can use this to find a matching namespace from all declared class names:

function namespaceExists($namespace) {
    $namespace .= "\\";
    foreach(get_declared_classes() as $name)
        if(strpos($name, $namespace) === 0) return true;
    return false;
}

另一个示例，以下脚本生成声明的名称空间的分层数组结构:

Another example, the following script produces a hierarchical array structure of declared namespaces:

<?php
namespace FirstNamespace;
class Bar {}

namespace SecondNamespace;
class Bar {}

namespace ThirdNamespace\FirstSubNamespace;
class Bar {}

namespace ThirdNamespace\SecondSubNamespace;
class Bar {}

namespace SecondNamespace\FirstSubNamespace;
class Bar {}

$namespaces=array();
foreach(get_declared_classes() as $name) {
    if(preg_match_all("@[^\\\]+(?=\\\)@iU", $name, $matches)) {
        $matches = $matches[0];
        $parent =&$namespaces;
        while(count($matches)) {
            $match = array_shift($matches);
            if(!isset($parent[$match]) && count($matches))
                $parent[$match] = array();
            $parent =&$parent[$match];

        }
    }
}

print_r($namespaces);

赠予:

Array
(
    [FirstNamespace] => 
    [SecondNamespace] => Array
        (
            [FirstSubNamespace] => 
        )
    [ThirdNamespace] => Array
        (
            [FirstSubNamespace] => 
            [SecondSubNamespace] => 

        )
)

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