Concrete dependency injection (ARCH7199)

Key php.quality.concrete-dependency · Severity info · Category quality

Typing dependencies as concrete classes violates the dependency inversion principle (DIP) and couples the class to a specific implementation. Depend on interfaces.

Incorrect

<?php
class ReportService
{
    public function __construct(private MySqlReportRepository $repo) {}
}

Correct

<?php
class ReportService
{
    public function __construct(private ReportRepository $repo) {}
}

Fix

Type constructor dependencies as interfaces/abstractions rather than concrete classes.