Get delete id in controller to delete mysql record

I have this in AuthController:

public function DelFunc() {

    if(Auth::check() === true) {
        $deleted = DB::delete('delete from funcionarios where id = ?',[$id]);
    }
    return redirect()->route('admin.login');
}

But I get this error: Undefined variable: id

I have this button in my view:

<a href="../admin/delFunc?id={{$empresa->id}}">
    <button class="btn btn-primary">Delete</button>
</a>

I know my question is simple, but, how can I get the id value on AuthController to delete this record?

I also have this route:

Route::get('/admin/delFunc', [App\Http\Controllers\AuthController::class, 'delFunc'])->name('delFunc');

Solution

A bunch of red flags here:

Why is this going into a controller called AuthController when it is working with a Funcionario object?
Why direct database queries instead of using Eloquent models?
You should not be deleting items by GET method, this is very dangerous.
Authentication is to be done by middleware, not by checking within every controller method.
And last, your method should also have a more conventional name like destroy.

Route parameters are defined in the route definition with braces like "/admin/delete/{func}" and then bound to objects in the controller method definition.

So, putting all that together, what it should look like is:

<?php

use App\Http\Controllers\FuncionarioController;
use Illuminate\Support\Facades\Route;

Route::middleware("auth")->group(function ($router) {
    $router->delete('/funcionario/{func}', [FuncionarioController::class, 'destroy'])
        ->name('funcionario.destroy');
});

And then in your controller:

<?php

namespace App\Http\Controllers;

use App\Models\Funcionario;

class FuncionarioController extends Controller {

    public function destroy(Funcionario $func)
    {
        $func->delete();
        return redirect()
            ->route('admin.login')
            ->with('success', __('Funcionario deleted'));
    }
}

And your view would look like this, assuming your value is passed in the $id variable:

<form method="post" action="{{ route("funcionario.destroy", $id) }}">
    @method('DELETE')
    @csrf
    <button type="submit">{{ __("Delete") }}</button>
</form>