# Fatal error: Uncaught Error: Cannot use 'App\Models\User' as a trait in /var/www/app/src/Models/Admin.php:10

- **ID:** `php/class-not-final-extends`
- **Domain:** php
- **Category:** type_error
- **Verification:** ai_generated
- **Fix Rate:** 95%

## Root Cause

PHP's use statement is misinterpreted when a class name is used in a trait context, typically because the developer accidentally wrote 'use App\Models\User;' inside a class body instead of extending it, or the class is not declared as a trait.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| PHP 8.0 | active | — | — |
| PHP 8.1 | active | — | — |
| PHP 8.2 | active | — | — |
| PHP 8.3 | active | — | — |

## Workarounds

1. **Replace 'use App\Models\User;' inside the class body with 'class Admin extends \App\Models\User' to properly inherit from the class.** (95% success)
   ```
   Replace 'use App\Models\User;' inside the class body with 'class Admin extends \App\Models\User' to properly inherit from the class.
   ```
2. **If the intent is to use a trait, ensure the source file defines a trait (e.g., 'trait User { }') and then use 'use User;' inside the class.** (90% success)
   ```
   If the intent is to use a trait, ensure the source file defines a trait (e.g., 'trait User { }') and then use 'use User;' inside the class.
   ```
3. **Check for typos: verify that the class file at src/Models/User.php declares 'class User' not 'trait User' or 'interface User'.** (85% success)
   ```
   Check for typos: verify that the class file at src/Models/User.php declares 'class User' not 'trait User' or 'interface User'.
   ```

## Dead Ends

- **** — Adding a 'use' statement at the top of the file for the class does not fix the error because the problem is the misuse of 'use' inside the class body to import a class, not a trait. (85% fail)
- **** — Renaming the class to a trait by adding 'trait User { }' works but changes the design incorrectly; the class should be extended with 'extends'. (60% fail)