PHP

PDO (PHP Data Objects) is the modern, secure way to connect PHP to MySQL. It supports prepared statements which eliminate SQL injection vulnerabilities.

Processing user input is at the heart of web development. PHP provides the $_GET and $_POST superglobals to access form data, but you must sanitise everything.

Functions let you name and reuse a block of code. PHP comes with thousands of built-in functions and makes it easy to define your own.

PHP is dynamically typed: variables do not need a declared type and can change type at runtime. Understanding this behaviour prevents many common bugs.

PHP is a server-side scripting language embedded in HTML. It powers a large portion of the web and is the engine behind WordPress, Drupal, and Laravel.