php dependency analysis

PHP Dependency analyzer

PHP DA is tool for check and support dependencies inside your project clear.

For example:

• You have project with 3 root namespaces: Domain, Application, Infrastructure
• You want to be sure dependencies in your project defined as graph

[
    'dependencies' => [
        'Domain' => null,
        'Application' => ['Domain'],
        'Infrastructure' => ['Domain', 'Application']
    ]
];

That means all classes from Domain namespace should use only classes from this namespace, and possibly vendor (it s configured).

All classes from Application can use classes from Domain and Application namespaces, but not from Infrastructure, etc

If some classes using dependencies not satisfied defined dependency graph, you give errors in report:

Have been analyzed 4 files
You have dependency problems in 2 files in your project:

Class ApplicationTrackingService have errors:
    - Class ApplicationTrackingService using class InfrastructureShipImplementation which not satisfy dependency graph

Class DomainCargo have errors:
    - Class DomainCargo using class ApplicationTrackingService which not satisfy dependency graph
    - Class DomainCargo using class InfrastructureShipImplementation which not satisfy dependency graph

Use cases

It can be useful in some cases for example:

• You want to extract part of your application in separate service, you define valid dependencies and run php-da for investigate workload
• You want to support low coupling in your application, you define valid dependencies and run php-da on your CI server for every MR, only for changed files
• You want to make visible structure changes of your application for all developers, now it is visible in php-da config

Quick start

Install library using composer

composer require paglliac/dependency-analysis

Configuration

Add configuration file config.php to root of your project :

return [
    /**
     * REQUIRED
     * Dependencies Graph
     *
     * Description of valid dependencies in project
     *
     * This config means
     *
     * Package (every class in namespace) Domain can use only classes from namespace Domain or vendor dependencies
     * Package Application can use only classes from namespaces Domain, Application or vendor dependencies
     * Package Infrastructure can use only classes from namespaces Domain, Application, Infrastructure or vendor dependencies
     */
    'dependencies' => [
        'Domain' => null,
        'Application' => ['Domain'],
        'Infrastructure' => ['Domain', 'Application']
    ],

    /**
     * REQUIRED
     * Source path where dependencies will be analyzed
     */
    'path' => __DIR__,

    /**
     * OPTIONAL
     *
     * Make available to use vendor dependencies in whole project
     *
     * true - all project classes can use vendor dependencies
     * false - all project can not use vendor dependencies
     */
    'skip_vendor_dir' => true,

    /**
     * OPTIONAL
     * Flag that define how to do when some files placed in namespaces not presented in Dependencies Graph
     *
     * true - mark class as having incorrect dependencies
     * false - skip this file
     *
     * For example, in directory we have namespace SomeNamespace with class SomeNamespaceSomeClass
     * if flag is true, it will be marked as incorrect file, if flag is true, this file wil be marked as correct
     */
    'fail_on_non_presented_namespace' => false,

    /**
     * OPTIONAL
     * Flag for php parser, correct values:
     *
     * PhpParserParserFactory::PREFER_PHP7 - 1 (default)
     * PhpParserParserFactory::PREFER_PHP5 - 2
     * PhpParserParserFactory::ONLY_PHP7 - 3
     * PhpParserParserFactory::ONLY_PHP5 - 4
     */
    'php_version' => PhpParserParserFactory::PREFER_PHP7,

    /**
     * OPTIONAL
     * 
     * List of allowed files extensions, all files with other extensions will be skipped from analysis
     * 
     * Default - ['php']
     */
    'allowed_extensions' => ['php']
];

Running

Run dependency validation:

/vendor/bin/php-da -c config.php [files filter]

Options:

• -c or --config is required option with the relative path to config file

Arguments:

• [files filter] list of files for analysis, it's useful to use in CI combine with --diff

Example of output

Have been analyzed 4 files
You have dependency problems in 2 files in your project:

Class ApplicationTrackingService have errors:
    - Class ApplicationTrackingService using class InfrastructureShipImplementation which not satisfy dependency graph

Class DomainCargo have errors:
    - Class DomainCargo using class ApplicationTrackingService which not satisfy dependency graph
    - Class DomainCargo using class InfrastructureShipImplementation which not satisfy dependency graph