Laravel's validation outside of Laravel

01_readme.md

How to use Laravel's validation outside of Laravel

Based on this SO question here is my implementation.

What is the difference?

The solutions in the SO question does not use custuom validation rules.

The custom Rule is calling the global trans() function. This is why it is in the helpers.php and registered via Composer.
This trans() function is also used to create the validator factory.

Example

Here is fully working PHP SDK with my solution: https://github.com/TMRW-Life/ntak.guru-php-sdk

Credits

• vivanov
• Valentine Shi

composer.json

//<project-path>/composer.json

{
    "require": {
        "php": "^8.1",
        "illuminate/translation": "^10.9",
        "illuminate/validation": "^10.9",
    },
    "autoload": {
        "files": [
            "src/helpers.php"
        ]
    }
}

helpers.php

//<project-path>/src/helpers.php

<?php

use Illuminate\Filesystem\Filesystem;
use Illuminate\Translation\FileLoader;
use Illuminate\Translation\Translator;

if (!function_exists('trans')) {
    /**
     * Translate the given message.
     *
     * This code is not really optimal outside of Laravel (without IOC container),
     * but it should not be used in production anyway.
     *
     * @param  string|null  $key
     * @param  array  $replace
     * @param  string|null  $locale
     * @return \Illuminate\Contracts\Translation\Translator|string|array|null
     */
    function trans(string $key = null, array $replace = [], string $locale = null): Translator|array|string|null
    {
        $translationDir = dirname(__DIR__).'/lang';

        $fileLoader = new FileLoader(new Filesystem(), $translationDir);
        $fileLoader->addNamespace('lang', $translationDir);
        $fileLoader->load('en', 'validation', 'lang');
        $translator = new Translator($fileLoader, 'en');
        $translator->setLocale('en');
        $translator->setFallback('en');

        if (is_null($key)) {
            return $translator;
        }

        return $translator->get($key, $replace, $locale);
    }
}

validation.php

//<project-path>/lang/en/validation.php

<?php

return [
    'accepted' => 'The :attribute must be accepted.',
    // ... rest of the validations
    // Copy it from Laravel. 
];

Validator.php

//<project-path>/scr/Validation/Validator.php

<?php

namespace <insert-your-namespace-here>;

use Illuminate\Validation\Factory;

class Validator
{
    protected Factory $validator;

    public function __construct()
    {
        $this->validator = new Factory(trans());
    }
}