Why does adding Composer autoloading to ThinkPHP fail?

I added the following to index.php in ThinkPHP:

<code>// 添加第三方库自动加载
require './vendor/autoload.php';</code>

However, when using it, it prompts that the class does not exist.

But adding require to Controller can be used.

<code>require APP_PATH.'../vendor/autoload.php'; </code>

What causes it? Can only one class loader exist? ThinkPHP also wrote one, causing it to overwrite Composer's class loader?

Does anyone know? thank you all.

I saw in this question, there was a respondent who said it was in the English document.

spl_autoload_register can handle situations where multiple loaders are required. In this case, spl_autoload_register will call previously registered loaders in sequence. In contrast, __autoload can only be defined once because it is a function.

There should be multiple ones.

Reply content:

I added the following to index.php in ThinkPHP:

<code>// 添加第三方库自动加载
require './vendor/autoload.php';</code>

However, when using it, it prompts that the class does not exist.

But adding require to Controller can be used.

<code>require APP_PATH.'../vendor/autoload.php'; </code>

What causes it? Can only one class loader exist? ThinkPHP also wrote one, causing it to overwrite Composer's class loader?

Does anyone know? thank you all.

I saw in this question, there was a respondent who said it was in the English document.

spl_autoload_register can handle situations where multiple loaders are required. In this case, spl_autoload_register will call previously registered loaders in sequence. In contrast, __autoload can only be defined once because it is a function.

There should be multiple ones.

Version 5.0 supports automatic loading of class libraries installed by Composer. You can call them directly according to the namespace in the Composer dependent library.

This means that thinkphp has incorporated the automatic loading mechanism of composer. You only need to use composer to download the dependent class library. After downloading, just use use to import the namespace where needed. You do not need to do it yourself. Write require APP_PATH.'../vendor/autoload.php';.

Pfft, I know what caused it... Before require was in ThinkPHP.php, after it was introduced, it actually started when require './ThinkPHP/ThinkPHP.php'; The core code of ThinkPHP has been executed, and it has entered the Controller through routing...

Wrong:

<code>// 引入ThinkPHP入口文件
require './ThinkPHP/ThinkPHP.php';

// 添加第三方库自动加载
require './vendor/autoload.php';</code>

Right:

<code>// 添加第三方库自动加载
require './vendor/autoload.php';

// 引入ThinkPHP入口文件
require './ThinkPHP/ThinkPHP.php';</code>