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• 2. Why This Primer Exists
• 6. Classes & Autoloading — How Modern PHP Organizes Code
• 7. Error Handling — Exceptions, Types, and Failure Modes
• 2. Execution Flow — How PHP Processes a File
• 5. Functions & Closures — How PHP Captures Context
• 1. Understanding how PHP "thinks": Overview
• 8. Putting It All Together — How PHP Actually Thinks
• 3. Request Lifecycle — What Happens During a Request
• 4. Scope & Lifetime — Where Variables Live
• PHP Primer for the AI Era

• 1. Understanding how PHP "thinks": Overview
• 2. Execution Flow — How PHP Processes a File
• 3. Request Lifecycle — What Happens During a Request
• 4. Scope & Lifetime — Where Variables Live
• 5. Functions & Closures — How PHP Captures Context
• 6. Classes & Autoloading — How Modern PHP Organizes Code
• 7. Error Handling — Exceptions, Types, and Failure Modes
• 8. Putting It All Together — How PHP Actually Thinks