Normalizes a parameter from Laravel's middleware declaration.

NormalizesMiddlewareParameter.php

<?php

namespace YOURNAMESPACE;

use function is_numeric;
use function strtolower;

trait NormalizesMiddlewareParameter
{
    /**
     * Normalizes a parameter from the middleware declaration.
     * 
     * @param  string  $parameter
     * @return bool|int|float|string|null
     */
    protected function normalize(string $parameter): bool|int|float|string|null
    {
        if (is_numeric($parameter)) {
            $parameter = (float) $parameter;
            
            return $parameter == (int) $parameter ? $parameter : (int) $parameter;
        }

        return match (strtolower($parameter)) {
            'null', '' => null,
            'false' => false,
            'true' => true,
            default => $parameter,
        };
    }
}