How to implement data selection and processing in groups or batches in Laravel?

In Laravel, the chunk() or chunkById() methods are used on Eloquent or Query Builder to retrieve and process data in groups or batches. This allows handling large volumes of data in parts, so as not to load the entire dataset into memory.

Example using chunk():

use App\Models\User;

User::chunk(100, function ($users) {
    foreach ($users as $user) {
        // process each user
    }
});

The chunkById() method is useful if data may change during processing, as it uses the id for pagination:

User::chunkById(100, function ($users) {
    foreach ($users as $user) {
        // process
    }
});

This way, large tables can be processed efficiently without memory issues.