PHP programming tutorials and interview questions
PHP performance — OpCache, fixing N+1 queries, APCu caching, and profiling with Xdebug.
Learn SQL injection, XSS, CSRF, and secure file uploads — the top PHP security threats and their defences.
Learn validation vs sanitization, filter_var, custom rules, and a reusable Validator class.
Learn PHP magic methods — __construct, __destruct, __get, __set, __toString, __invoke.
Learn static methods, static properties, utility classes, and the Singleton pattern.
Learn abstract classes vs interfaces with real-world examples and guidelines.