How to add value to request parameter in Laravel?

There are several ways you can add a value to a request parameter in Laravel. Here are a few options:

Use the merge method:

$request->merge(['key' => 'value']);

This will add the key => value pair to the request parameter array.

Use the request helper function:

$request->request->add(['key' => 'value']);

Use the flash method:

$request->flash();
$request->flashOnly('key', 'value');
$request->flashExcept('key');

The flash method will store the request data in the session, while the flashOnly and flashExcept methods allow you to specify which data should be stored in the session.