> For the complete documentation index, see [llms.txt](https://phper.shujuwajue.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://phper.shujuwajue.com/php-gao-ji-te-xing/zi-dong-jia-zai.md).

# 自动加载(Autoload)

```php
方式1:
__autoload($className);
方式2:
spl_autoload_register($func1);
spl_autoload_register($func2);
方式3:
spl_autoload($className[, $extensions]);
spl_autoload_extensions();
```

方式2示例:

则会直接去目录model\Test中自动引入

```php
<?php

use model\Test;

spl_autoload_register(function($className) {
    echo $className;  //model\Test
    include(__DIR__.'/'.str_replace('\\', '/', $className).'.php');
});

$test = new Test();
$test->query();
```

方式3:

```php
<?php

define('CLASS_DIR', 'class/');

set_include_path(get_include_path().PATH_SEPARATOR.CLASS_DIR);

// autoload ClassName.class.php 
spl_autoload_extensions('.class.php');

// Use default autoload implementation
spl_autoload_register();
```


---

# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://phper.shujuwajue.com/php-gao-ji-te-xing/zi-dong-jia-zai.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.