A micro-kernel for PHP applications

This library contains a micro-kernel for bootstrapping almost any PHP application, including Silex, Symfony Console and Lumen. The kernel itself is just about 400 lines of code to set a bunch of default parameters for your application and create a service container instance with that. To see a complete framework based on the micro-kernel please go to https://github.com/symlex/symlex.

Creating a kernel instance and calling run() is enough to start your application:

#!/usr/bin/env php
<?php

require_once 'vendor/autoload.php'; // Composer

$app = new \DIMicroKernel\Kernel('console');

$app->run(); // runs the 'app' service defined in config/console.yml

Configuration

YAML files located in config/ configure the application and all of it's dependencies as a service. The filename matches the application's environment name (e.g. config/console.yml). The configuration can additionally be modified for sub environments such as local or production by providing a matching config file like config/console.local.yml (see app.sub_environment parameter). These files are in the same well documented format you might know from Symfony:

parameters:
    app.name: 'My App'
    app.version: '1.0'

services:
    doctrine.migrations.migrate:
        class: Doctrine\DBAL\Migrations\Tools\Console\Command\MigrateCommand
        
    app:
        class: Symfony\Component\Console\Application
        arguments: [%app.name%, %app.version%]
        calls:
            - [ add, [ "@doctrine.migrations.migrate" ] ]

This provides a uniform approach for bootstrapping Web applications like Silex\Application or command-line applications like Symfony\Component\Console\Application using the same kernel. The result is much cleaner and leaner than the usual bootstrap and configuration madness you know from many frameworks.

The kernel base class can be extended to customize it for a specific purpose such as long running console applications:

<?php

use DIMicroKernel\Kernel;

class ConsoleApp extends Kernel
{
    public function __construct($appPath, $debug = false)
    {
        parent::__construct('console', $appPath, $debug);
    }

    public function setUp()
    {
        set_time_limit(0);
        ini_set('memory_limit', '-1');
    }
}

Default parameters

The kernel sets a number of default parameters that can be used for configuring services. The default values can be changed via setter methods of the kernel or overwritten/extended by container config files and environment variables in $_SERVER (names are converted to lower case and __ is converted to .).

Parameter	Getter method	Setter method	Default value
app.name	getName()	setName()	'Kernel'
app.version	getVersion()	setVersion()	'1.0'
app.environment	getEnvironment()	setEnvironment()	'app'
app.sub_environment	getSubEnvironment()	setSubEnvironment()	'local'
app.debug	isDebug()	setDebug()	false
app.charset	getCharset()	setCharset()	'UTF-8'
app.path	getAppPath()	setAppPath()	'./'
app.config_path	getConfigPath()	setConfigPath()	'./config'
app.base_path	getBasePath()	setBasePath()	'../'
app.storage_path	getStoragePath()	setStoragePath()	'../storage'
app.log_path	getLogPath()	setLogPath()	'../storage/log'
app.cache_path	getCachePath()	setCachePath()	'../storage/cache'
app.src_path	getSrcPath()	setSrcPath()	'../src'

Caching

If debug mode is turned off, the service container configuration is cached by the kernel in the directory set as cache path. You have to delete all cache files after updating the configuration. To disable caching completely, add container.cache: false to your configuration parameters:

parameters:
    container.cache: false

Composer

If you are using composer, simply add "symlex/di-microkernel" to your composer.json file and run composer update:

"require": {
    "symlex/di-microkernel": "^1.2"
}