Field injection (ARCH7200)

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Key php.quality.field-injection · Severity warning · Category quality

Injecting through fields (via annotations) hides dependencies, breaks immutability, and complicates unit testing. Inject dependencies through the constructor.

Incorrect

<?php
class InvoiceService
{
    #[Inject]
    private Mailer $mailer;
}

Correct

<?php
class InvoiceService
{
    public function __construct(private readonly Mailer $mailer) {}
}

Fix

Inject dependencies as constructor parameters instead of using field injection.