Older tutorials often taught mysqli or even deprecated mysql functions. PDO is the modern standard because it is database-agnostic and provides secure, prepared statements to prevent SQL injection attacks. By focusing on PDO, the book prioritizes security and best practices over convenience.
By midnight, the book was covered in neon sticky notes. He had mastered the new and cleaned up his database joins. The "hot" book wasn't just a manual; it was a rescue mission for his career.
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