Templates and Presentation: Core Concepts for Modern PHP Web Development

Build the mental model

Templates and Presentation focuses on this learner need: Run PHP predictably and organize application behavior with types, objects, templates, escaping, and separation between request/business logic and presentation. Use Composer-managed PHP application boundaries, PSR-style HTTP requests and handlers, templates, PDO-backed domain data, validation, sessions/passwords, PHPUnit feedback, and deployment/security configuration as concrete evidence.

Track the changing state and identify the evidence that makes that state observable.

Identify the parts and boundaries

In Templates and Presentation, pHP CLI/runtime and errors. Classes, visibility, and typed methods. Use Composer-managed PHP application boundaries, PSR-style HTTP requests and handlers, templates, PDO-backed domain data, validation, sessions/passwords, PHPUnit feedback, and deployment/security configuration as concrete evidence.

1. 1

   PHP CLI/runtime and errors.

2. 2

   Classes, visibility, and typed methods.

3. 3

   Template data flow.

4. 4

   HTML escaping and presentation boundaries.

Trace one concrete case

Choose one realistic input for Templates and Presentation and trace it using this path lens: Use Composer-managed PHP application boundaries, PSR-style HTTP requests and handlers, templates, PDO-backed domain data, validation, sessions/passwords, PHPUnit feedback, and deployment/security configuration as concrete evidence. Predict the result before running the example, then compare prediction with evidence.

If the prediction fails, identify the assumption before changing the implementation.

TEMPLATES AND PRESENTATION
==========================
1. PHP CLI/runtime and errors.
2. Classes, visibility, and typed methods.
3. Template data flow.
4. HTML escaping and presentation boundaries.
Evidence: the module-specific command, output, test, rendered state, query result, log, or measurement that proves the exercise worked

Read the concept map, predict one concrete result, then compare that prediction with the module example or native tool.

A module-specific concept trace connecting core decisions to observable evidence.

practice/\n├── README.md\n├── templates-and-presentation-concept-map.txt\n└── evidence/\n    └── expected-result.txt

Compare a nearby alternative

For Templates and Presentation, compare the shown mechanism with a nearby alternative. Use this technical point—Template data flow.—inside this path context: Use Composer-managed PHP application boundaries, PSR-style HTTP requests and handlers, templates, PDO-backed domain data, validation, sessions/passwords, PHPUnit feedback, and deployment/security configuration as concrete evidence.

State the tradeoff in your own words.

Explain it back with evidence

Summarize Templates and Presentation without reading the example. Explain the input or state, operation or decision, and result through this implementation lens: Use Composer-managed PHP application boundaries, PSR-style HTTP requests and handlers, templates, PDO-backed domain data, validation, sessions/passwords, PHPUnit feedback, and deployment/security configuration as concrete evidence.

For Templates and Presentation, use this evidence standard: the module-specific command, output, test, rendered state, query result, log, or measurement that proves the exercise worked. Interpret the evidence through this path context: Use Composer-managed PHP application boundaries, PSR-style HTTP requests and handlers, templates, PDO-backed domain data, validation, sessions/passwords, PHPUnit feedback, and deployment/security configuration as concrete evidence.

Common mistakes to avoid

• Wrong PHP/runtime configuration.
• Business logic embedded in templates.
• Unescaped output.
• State mutated from multiple layers.