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Slim 3 Skeleton

What's included?

• Slim v3
• Slim Twig-View + Twig v2
• Slim Flash Messages
• Slim CSRF Protection
• Akrabat Slim Session Middleware
• Symfony Yaml Component v3
• Swift Mailer v6
• Monolog v1

Installation

Required: PHP 7 and Composer

Run the following command, replacing [your-project-name] with the name of the folder you want to create.

This skeleton includes a .htaccess file for Apache but Slim supports other Web servers.

• Optional: create a virtual host that points to public folder
• When using Apache, make sure it has AllowOverride All for your project path (or a parent folder) for Slim URL rewriting to work
• Make sure var folder is writable by Web server

Configuration

Configuration files are stored in config folder. There is one YAML file per subject/package, for better readability/management. Other package-specific configuration files can be stored there (and then need to be handled in application code). You can also add whatever you need into app.yaml file as it is up to you to use new configuration values in application code.

Some configuration values can change from an environment to another. Current environment name is read from ENVIRONMENT env variable (default = development). Environment-specific configuration files override values from global configuration. Simply copy-paste one existing YAML file into a folder whose name is a valid environment name. Then edit this file and remove everything except the values you want to change for this environment. There are examples in development-example and production-example folders.

Configuration is available in application through:

• $config variable in src/bootstrap.php
• Container's settings entry: $container->settings usually and $this->settings in controllers extending App\Controllers\Controller
• config variable in Twig templates: {{ config.my_custom_setting_key }}, but it contains only app and security configuration files

Controllers

Controllers can inherit from App\Controllers\Controller class.

It provides a render() method and automatic access to Slim Container entries through $this->my_service_entry_name

Session

In session.yaml configuration file, you can enable or disable session usage.

Session is required if you want to use Flash messages or CSRF protection.

CSRF

If session is enabled, CSRF token is generated for each request.

In security.yaml configuration file, you can enable token persistence: a token is generated for each user but not for each request. Simplifies usage of Ajax but makes application vulnerable to replay attacks if you are not using HTTPS.

If CSRF check fails, the request has a csrf_status attribute set to false. You can check this attribute/value in routes/controllers:

In Twig templates, you can add CSRF hidden fields with:

If you want to make something custom, you can also access to CSRF token values:

Flash Messages

If session is enabled, Flash Messages are available.

To add a message within a route/controller:

To get a message in a Twig template:

To get all messages:

Emails

In swiftmailer.yaml configuration file, you can enable usage of SwiftMailer and then use mailer entry from container as Swift_Mailer object in your code.

By configuring SwiftMailerHandler (+ swiftmailer.yaml file) or NativeMailerHandler in monolog.yaml configuration file, you can enable or disable sending email with Monolog when an error occurs.

HTML meta tags

Every key: value pair you add under metas in app.yaml configuration file will be output in HTML head section as a meta tag.

Title

Page title is a special case. Obviously, title and title_separator entries won't be output as meta tags like the other ones.

A page title is compound as follows:

• content of the metaTitle block a template child could define

• if app.metas.title configuration entry is not empty:
  • if app.metas.title_separator configuration entry is not empty, add the separator
  • add app.metas.title

Code quality tools

Run the following commands to check your code:

• PHP_CodeSniffer vendor/bin/phpcs --standard=PSR1,PSR2,PSR12 ./src/
• PHP Coding Standards Fixer vendor/bin/php-cs-fixer fix ./src/ --verbose --dry-run --diff
• PHP Mess Detector vendor/bin/phpmd ./src/ text cleancode,codesize,controversial,design,naming,unusedcode

License

The MIT License (MIT). Please see License File for more information.