# Page Not Found

The URL `files/nEPTiX6CfBHBIsLdIAm1` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Viết hàm cắt chuỗi](https://learnphp.gitbook.io/learnphp/viet-ham.md)
- [[BÀI 34] HƯỚNG DẪN VIẾT MỘT TRANG WEB CƠ BẢN (PHẦN 3: THỰC HIỆN CÁC CHỨC NĂNG USER)](https://learnphp.gitbook.io/learnphp/untitled.md)
- [Tìm hiểu về mysqli_fetch_field_direct (ok)](https://learnphp.gitbook.io/learnphp/tim-hieu-ve-mysqli_fetch_field_direct-ok.md)
- [Getting the location from an IP address [duplicate]](https://learnphp.gitbook.io/learnphp/getting-the-location-from-an-ip-address-duplicate.md)
- [Generate PDF File From MySQL Database Using PHP](https://learnphp.gitbook.io/learnphp/generate-pdf-file-from-mysql-database-using-php.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://learnphp.gitbook.io/learnphp/viet-ham.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://learnphp.gitbook.io/learnphp/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://learnphp.gitbook.io/learnphp/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/learnphp/viet-ham.md`).

You may also use `Accept: text/markdown` header for content negotiation.