Data and packages

6 lessons in the PHP course.

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• PDO IntroQuery a database safely with PDO prepared statements.
• SessionsRemember data across requests with PHP sessions.
• Composer BasicsManage PHP dependencies with Composer and autoloading.
• ErrorsDisplay, log, and throw errors productively while learning.
• File BasicsRead and write local files with careful error checks.
• JSON BasicsEncode and decode JSON for APIs and simple storage.