PHP

The classic server-side scripting language.

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This course has 4 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.

Lessons

PHP: getting startedHow PHP runs on the server, mixing code with HTML, and the request/response model behind almost every classic website.
PHP variables and stringsDynamic typing, interpolation, heredoc, and the loose-comparison quirks that cause real security bugs.
PHP arraysOne type for lists and maps, the array functions worth knowing, and array_map/filter across collections.
Forms, sessions and safetyHandling GET and POST, validating input, keeping sessions, and the defences against the classic web attacks.

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Last refreshed 2026-09-17.