（codeigniter / Neo4j）PHP：名称空间和自动加载器((codeigniter/Neo4j) PHP : namespace and autoloader)

 当我试图在codeigniter（v2.2.x）中安装Neo4jPHP库时，我遇到了有关名称空间的恼人问题。 我一直在寻找4个小时没有成功。 
 
 简而言之，有一个库目录，其中必须复制Neo4jPHP。 所以在'libraries /'中，有一个目录'Everyman / Neo4j /'，它包含所有Neo4j php类。 
 
 此外，在相同的'libraries'目录中，有一个带有自动加载器功能的类，其目的是加载Neo4j类（在'Everyman / Neo4j /'中）。 
 
 在'图书馆'里面 
 
- libraries/
     |-- Everyman/
             |-- Neo4j/
                   |-- Client.php
                   |-- some_other_classes.php
     |-- Neo4j.php
 
 然后，在我的代码中的某个地方，在全局命名空间中，我尝试实例化类客户端： 
 
$client = new Client();
 
 但我得到错误类'客户'未找到 。 
 
 在类客户端中，指定了以下命名空间： Everyman \ Neo4j 。 
 
 我必须承认我找到了2个解决此问题的方法： 
 
 从调用代码中，使用完全限定名称： 
 
new Everyman\Neo4j\Client();
 
 或者，在Client.php中，删除命名空间。 
 
 在这两种情况下，它的工作原理。 但是，我想用这两个条件调用Client类：1。我不想修改Neo4jPhp库中的任何内容。 2.我真的不想使用完全限定名称（Everyman \ Neo4j \ Client）。 我想使用“new Client（）”。 
 
 你们是否知道如何实现这一点（是的，我对命名空间和加载器没有非常深刻的理解）。 
 
 在Neo4j.php（带加载程序的文件） 
 
 <?php
    class Everyman{

    public function __construct()
    {
        spl_autoload_register(array($this,'autoload'));
    }

    public function autoload($sClass){
            $sLibPath = __DIR__.DIRECTORY_SEPARATOR;
    //Below, i modified the instruction so that the class file
    //can be found. However, the class is not found.
            $sClassFile = 'Everyman'.DIRECTORY_SEPARATOR.'Neo4j'.str_replace('\\',DIRECTORY_SEPARATOR,$sClass).'.php';
            $sClassPath = $sLibPath.$sClassFile;
            if (file_exists($sClassPath)) {
                require($sClassPath);
            }
        }
    }
 
 就是这样了。 我想我已经把你所有的信息都告诉了你。 如果没有人可以帮助我，我将不得不使用'new Everyman \ Ne4j \ Client（）;' （有效）。 
 
 寻求帮助似乎很愚蠢，因为我已经找到了2个解决方法，但我真的想学习如何正确处理这个问题（如果可能的话）。 
 
 谢谢。 

As i'm trying to install the Neo4jPHP library in codeigniter (v2.2.x), i'm having annoying issues regarding namespaces. I've been searching for 4 hours without success.
 
In short, there is a libraries directory in which Neo4jPHP must be copied. So in 'libraries/', there is a directory 'Everyman/Neo4j/', which contains all the Neo4j php classes.
 
Also, in the same 'libraries' directory, there is a class with an autoloader function, which aims at loading the Neo4j classes (which are in 'Everyman/Neo4j/').
 
Inside of 'libraries'
 
- libraries/
     |-- Everyman/
             |-- Neo4j/
                   |-- Client.php
                   |-- some_other_classes.php
     |-- Neo4j.php
 
Then, somewhere in my code, in the global namespace, i try to instantiate the class client :
 
$client = new Client();
 
But i get the error Class 'Client' not found.
 
In the class client, the following namespace is specified : Everyman\Neo4j.
 
I'm must admit that i found 2 workarounds for this issue :
 
From the calling code, use the fully qualified name :
 
new Everyman\Neo4j\Client();
 
Or, in Client.php, remove the namespace.
 
In these 2 cases, it works. However, i would like to call the Client class with these 2 condition : 1. I don't want to modify anything from the Neo4jPhp library. 2. I really don't want to have to use the fully qualified name (Everyman\Neo4j\Client). I want to use "new Client()".
 
Do you guys have an idea how i could achieve this (yes, i don't have a very deep understanding of namespaces, and loaders).
 
In Neo4j.php (file with loader)
 
 <?php
    class Everyman{

    public function __construct()
    {
        spl_autoload_register(array($this,'autoload'));
    }

    public function autoload($sClass){
            $sLibPath = __DIR__.DIRECTORY_SEPARATOR;
    //Below, i modified the instruction so that the class file
    //can be found. However, the class is not found.
            $sClassFile = 'Everyman'.DIRECTORY_SEPARATOR.'Neo4j'.str_replace('\\',DIRECTORY_SEPARATOR,$sClass).'.php';
            $sClassPath = $sLibPath.$sClassFile;
            if (file_exists($sClassPath)) {
                require($sClassPath);
            }
        }
    }
 
So that's it. I think i've given you all the information i have. If no one can help me, i'll have to use 'new Everyman\Ne4j\Client();' (which works). 
 
It may seem stupid to ask for help, as i already have found 2 workarounds, but i really want to learn how to properly handle this issue (if possible).
 
Thanks.

原文：https://stackoverflow.com/questions/32194973