问题描述
我们想在我们的一个控制器中使用 FPDF 库.
We want to use the FPDF library in one of our controllers.
我们创建了以下文件:
app
-Lib
--Fpdf
---files.php
---fpdf.php
---fdpf_wrapper.php <-- this is our class (FdpfWrapper) which extends the base FPDF class
就在控制器类之前，我们试试这个:
Right before the controller class, we try this:
App::uses('FpdfWrapper', 'Lib/Fpdf');
但每次都失败.我们做错了什么?
But it fails every time. What are we doing wrong?
推荐答案
首先，必须注册包路径才能与 App::uses 和 Lib/Fpdf没有这样的，默认只注册核心包.
First of all, package paths must be registered in order to be used with App::uses, and Lib/Fpdf is no such one, by default only the core packages are registered.
您可以扩展现有包的路径，在您的情况下为 Lib:
You could either extend the paths for an already existing package, in your case that would be Lib:
App::build(array('Lib' => array(APP . 'Lib' . DS . 'Fpdf' . DS)));
然后使用 App::uses('FpdfWrapper', 'Lib');
http://book.cakephp.org/2.0/en/core-utility-libraries/app.html#adding-paths-for-app-to-find-packages-in
或者更好地添加一个新包:
or better add a new package:
App::build(array('Lib/Fpdf' => array(APP . 'Lib' . DS . 'Fpdf' . DS)), App::REGISTER);
http://book.cakephp.org/2.0/en/core-utility-libraries/app.html#add-new-packages-to-an-application
然后你可以使用 App::uses('FpdfWrapper', 'Lib/Fpdf');
最后但并非最不重要的一点，当然文件名必须遵循@Nunser 已经提到的 CakePHP 约定，即 fdpf_wrapper.php 必须重命名为 FdpfWrapper.php
And last but not least, of course the filename must follow the CakePHP conventions as already mentioned by @Nunser, ie fdpf_wrapper.php must be renamed to FdpfWrapper.php
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