Defensible by designDecisions remain reviewable and evidenced.
Transparent processScope, ownership and boundaries stay visible.
Client-first partnershipWork starts with the operating need.
Secure by defaultAccess and sensitive data stay controlled.
Beyond ZeroEngineering curriculum preview15–20 minute preview

PHP Beyond Zero · Lesson 01 of 16

Composer, PSR Conventions, and Application Boundaries

Understand where Composer, PSR Conventions, and Application Boundaries fits in a maintainable, testable, and reviewable engineering workflow.

Curriculum preview for chapter 1 of PHP Beyond Zero. It positions Composer, PSR Conventions, and Application Boundaries inside the larger pathway from architecture and verification to secure delivery and operations.

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Why this matters

Understand the consequence before the technique.

Composer, PSR Conventions, and Application Boundaries affects more than implementation detail. It changes how the system can be reviewed, changed, secured, released, and operated by someone other than the original author.

Key questions

  • What engineering decision is hidden inside composer, psr conventions, and application boundaries?
  • Which assumptions, failure modes, and boundaries must be recorded?
  • What evidence would let another reviewer verify the result?

Lesson outline

Four stages from recognition to action.

  1. 01

    Frame the decision

    Identify the requirement, trade-off, or failure mode behind composer, psr conventions, and application boundaries.

  2. 02

    Define the boundary

    Separate stable domain behaviour from framework, transport, storage, or platform concerns.

  3. 03

    Verify the behaviour

    Choose tests, measurements, and review evidence that match the actual risk.

  4. 04

    Plan delivery and operation

    Record deployment, diagnostics, limitations, recovery, and the next review point.

Practice prompt

Turn recognition into a repeatable response.

Write a one-page decision record for Composer, PSR Conventions, and Application Boundaries. Include the context, chosen boundary, rejected alternative, verification evidence, operational signals, and rollback or recovery path.

Use fictional or sanitised information. Do not place private, exploitative, illegal, or identifying material into a public worksheet or shared example.

Related topic hubs

See the lesson inside a wider skill or safety system.

Topic hubSoftware architecture and boundariesLearn how requirements, domain models, modules, APIs, state ownership, and service boundaries shape systems that can change without becoming fragile.Topic hubSecurity, identity, and trust boundariesExplore authentication, authorisation, sessions, input handling, secrets, dependency risk, tenant isolation, and the places where one system must decide whether another actor or payload is trusted.Topic hubData, persistence, and transactionsUnderstand persistence boundaries, repositories, transactions, migrations, consistency, caches, and data contracts before the database becomes the hidden architecture of the application.

Related lessons

Continue through the same source book.

PHP Beyond Zero · 02Strict Types, Value Objects, Enums, and Readonly DesignUnderstand where Strict Types, Value Objects, Enums, and Readonly Design fits in a maintainable, testable, and reviewable engineering workflow.PHP Beyond Zero · 03Composition, Interfaces, and SOLID Without CeremonyUnderstand where Composition, Interfaces, and SOLID Without Ceremony fits in a maintainable, testable, and reviewable engineering workflow.PHP Beyond Zero · 04HTTP Kernels, Middleware, Routing, and Request LifecyclesUnderstand where HTTP Kernels, Middleware, Routing, and Request Lifecycles fits in a maintainable, testable, and reviewable engineering workflow.

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