PHP用变量实例化obj类不起作用

Question

我发现了一个问题，我不确定是 php 的错误还是我的代码（可能是我的）的错误，所以让我告诉你发生了什么：

<?php namespace MyApp\Conciliation;

use SimpleExcel\SimpleExcel;
use ForceUTF8\Encoding;
use MyApp\Conciliation\Gol;

class Conciliation {

    protected function equalizeFile($file, $providerName)
    {
        $type = false;
        $nfile = 'public'.$file;

        // TEST 1: the ideal aproach. not working (see error#1 bellow)
        $provider = new $providerName();

        // TEST 2: working, getting the correct response
        $provider = new Gol();

        // TEST 3: working, getting the correct response
        $provider = new MyApp\Conciliation\Gol();

        $provider->equalize($nfile);

    }

注意，$providerName = 'Gol';

错误1 找不到类“Gol”

http://inft.ly/N8Q6F4B

那么，有什么方法可以让我继续使用变量来实例化类似于上面的别名？

---

编辑，问题已解决：工作示例

<?php namespace MyApp\Conciliation;

use SimpleExcel\SimpleExcel;
use ForceUTF8\Encoding;

class Conciliation {

    protected function equalizeFile($file, $providerName)
    {
        $type = false;
        $nfile = 'public'.$file;

        $providerName = "MyApp\\Conciliation\\".$providerName;
        $provider = new $providerName();

        $provider->equalize($nfile);
    }

Answer 1

http://php.net/manual/en/language.namespaces.dynamic.php

如果要动态调用类，则必须使用类的完整路径。

所以，您对equalizeFile 的调用应该类似于：

equalizeFile("myFile", "MyApp\\Conciliation\\Gol");