Converts Strings like 'true', 'on' and 'false' to boolean on Requests in Laravel.

ConvertStringBooleans.php

<?php

/**
  * Based on https://github.com/laravel/ideas/issues/514#issuecomment-299038674
  */
  
namespace App\Http\Middleware;

use Illuminate\Foundation\Http\Middleware\TransformsRequest;

class ConvertStringBooleans extends TransformsRequest
{
    protected function transform($key, $value)
    {
        $val = strtolower($value);

        if ($val === 'true' || $val === 'on') {
            return true;
        }

        if ($val === 'false') {
            return false;
        }

        return $value;
    }
}