Yii2 Dev Laravel Package

Product Decisions This Supports

• Framework vs. library framing. This is not a Laravel package — it is a competing full-stack PHP framework with its own DI container (Yii::$container), service locator (Yii::$app), ActiveRecord ORM, asset pipeline, view renderer, and error handler. PM decisions here are architecture-level: do we run a separate Yii service, replace Laravel, or decline? Not "should we composer require this."
• Inheritance / M&A integration. The single most likely reason this appears in a roadmap review is an acquired or inherited Yii 2 codebase. The decision set becomes: contain it behind an API boundary, migrate it to Laravel, or maintain-and-extend. Budgeting, staffing, and timeline follow directly from that choice.
• Build-vs-buy reference point. Even if we never adopt it, Yii 2 is a mature (14.3k stars, BSD-3-Clause, documented release cycle, Codecov + static-analysis CI) benchmark for what "batteries-included" looks like: RBAC, i18n, caching, migrations, CSRF/XSS helpers, Gii code generation, and a debugger shipped in-core. Useful when scoping which capabilities we must assemble from Laravel packages versus what comes free elsewhere.
• Security-gate decision. CVE-2026-39850 (fixed in 2.0.55) affects View::renderPhpFile() and ErrorHandler::renderFile() — parameter collisions could override included file paths. Any Yii surface we own or inherit must be on ≥ 2.0.55. This is a PM-visible compliance item, not just an engineering note.
• Roadmap horizon / exit planning. Recent releases (2.0.52–2.0.55) are dominated by PHP-version compatibility (8.5, 8.6), PHPStan/Psalm annotation work, dead-code removal, and bug fixes; README branding already shows Yii 3's logo. That is maintenance-mode velocity. A PM should treat Yii 2 as a support-horizon problem with a second migration (Yii 3) possibly layered on top — factor it into any 24-month plan.
• Talent and operational cost modeling. A smaller Yii talent pool than Laravel/Symfony, and our static analysis, observability, and CI templates are Laravel-shaped. Headcount and platform-team load are legitimate roadmap inputs.
• Use cases where it does justify inclusion. Standalone internal tools or services with an API/database boundary; a contained legacy surface with no near-term rewrite appetite; evaluation of "alternatives to Laravel" for a genuinely greenfield, isolated app where speed-to-first-release matters more than ecosystem fit.

When to Consider This Package

Consider it (as a framework decision, not a dependency) when:

• There is an existing Yii 2 codebase — inherited, acquired, or legacy — and you need a credible containment, hardening, or migration path.
• You are scoping a standalone service that talks to the rest of the platform over HTTP/API contracts, a shared database, namespaced Redis, and standards-based auth (OIDC/JWT) — and can accept operating a second runtime.
• You want a concrete benchmark for what a batteries-included framework provides, to pressure-test how much glue we're hand-assembling in Laravel.
• Someone on staff has run Yii 2 in production and can own it for the next 24 months.
• The workload's expected lifespan comfortably fits inside Yii 2.x's documented support horizon.
• You need a clean-license (BSD-3-Clause, safe for closed-source commercial) full-stack option.

Look elsewhere when:

• The default assumption is "a Laravel package." There is no service provider, no facade, no package auto-discovery, no Illuminate\ contract. Zero Composer dependents confirms nothing in our graph pulls it in.
• Co-residency in one Laravel process is required. Two containers, two error handlers, and competing global state is a category error, not an integration task.
• You need to borrow individual Yii components into Laravel. Namespaces (yii\ vs Illuminate\) don't collide, but instantiating a Yii component pulls in Yii::$app and therefore the application bootstrap.
• The strategic driver is a framework switch with no Yii 2 codebase to justify it — in that case evaluate Yii 3 directly rather than adopting a maintenance-mode 2.x.
• Laravel-shaped tooling, hiring, and platform conventions are non-negotiable constraints.
• Timeline is tight and the team has no Yii production experience.

Gate questions before any commitment: Is this greenfield or inherited? What is the actual driver — one app, one component, or a broad framework bake-off? Who owns it for 24 months? Does the workload outlive 2.x support? If choosing Yii deliberately, why 2.x and not 3?

How to Pitch It (Stakeholders)

To executives — one paragraph:

Yii 2 is a mature, permissively licensed, full-stack PHP framework — not a Laravel add-on. That distinction is the whole decision: adopting it means running and staffing a second framework alongside Laravel, not installing a library. The 14k-star, well-documented project is credible and actively patched, but its recent releases are compatibility and typing maintenance rather than feature investment, which tells us it is a long-term support obligation rather than a growth bet. Our recommendation is not to add it to the Laravel platform. We should treat it as either (a) a containment plan for an inherited Yii codebase, or (b) an approved option for a strictly isolated standalone service with a named owner and a defined support horizon — and require ≥ 2.0.55 for any surface we touch because of a recently fixed template-injection CVE. The cost of saying yes is a permanent second-runtime tax in hiring, tooling, and on-call; the cost of saying no to a legitimate legacy case is a stalled migration with no path forward.

To engineering — the short version:

Not installable into Laravel — no service provider, no facades, no auto-discovery, no Illuminate\ contracts, zero dependents. Running both in one process gives us two DI containers, two error handlers, and fighting global state. Realistic seams if we must integrate: HTTP/API contracts, shared DB, namespaced cache, OIDC/JWT instead of Yii's web user. Yii components can't be cherry-picked — instantiating one pulls Yii::$app and the whole bootstrap. If we do run it: pin ≥ 2.0.55 (CVE-2026-39850), and plan for the fact that the upstream roadmap has moved to Yii 3.