PHP Projects · Lesson 4 of 8

Blog Application

Structure a blog around posts, authors, publication state, and safe rendering.

Lesson

A blog commonly relates posts to authors and distinguishes drafts from published content. Public queries should return only published posts; editing routes need authentication and per-post authorization. Escape titles and excerpts, and use a deliberate rich-text sanitization policy if formatted content is supported. A publication filter belongs in the server-side query, not only in the template. Further guidance Turn the feature into a sequence of small vertical slices: input, validation, domain behavior, persistence, response, and tests. Write acceptance criteria before implementation, protect each operation with authorization, and verify invalid input and failure cases. Document setup and keep deployment secrets out of the repository. Practice task: Create a fresh example for Blog Application. Predict the result before running it, then change one input and explain why the result changes. Test a normal case and one boundary or invalid case where it applies. Compare your output with the example and note one rule you would use in a real project.

Code examples

Blog Application

SQL

SELECT posts.id, posts.title, users.name AS author
FROM posts
JOIN users ON users.id = posts.user_id
WHERE posts.is_published = 1
ORDER BY posts.published_at DESC;

Expected output

Published posts with their author names

Key points

Structure a blog around posts, authors, publication state, and safe rendering.
Build and verify one complete feature at a time.
Test invalid input, permissions, and failure paths before deployment.

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