Master $variable declarations, primitive scalar types, type casting, and declare(strict_types=1).

Work with double-quote interpolation, string concatenation (.), heredoc syntax, and math helpers.

Master modern PHP operators: spaceship (<=>), null coalesce (??), null-safe (?->), and magic constants.

Master conditional branching, traditional switch statements, and PHP 8 strict match expressions.

Iterate over collections, counters, and key-value maps with for, while, and foreach.

Declare typed functions, default parameters, variadic arguments, and modern PHP 8 named arguments.

Master indexed and associative arrays, array destructuring, array_map, array_filter, and array_reduce.

Work with $_GET, $_POST, $_SERVER, $_ENV, and sanitize inputs with htmlspecialchars and filter_var.

Format timestamps with date(), work with timezones, and master the modern DateTimeImmutable object.

Read and write files with file_get_contents, file_put_contents, and low-level resource streams (fopen/fwrite).

Persist state across stateless HTTP requests using setcookie(), session_start(), and $_SESSION.

Catch errors and runtime exceptions using try...catch...finally, custom Exception classes, and Throwable.

Define classes, instantiate objects ($this), and master modern PHP 8 constructor property promotion.

Master public, protected, private modifiers, class inheritance with extends, and parent:: calls.

Enforce architecture contracts with interface, implements, abstract classes, and polymorphic dispatch.

Horizontal code sharing with traits, static properties/methods (self::), and PSR-4 namespaces.

Connect to relational databases with PDO and execute secure queries using parameterized prepared statements.

Emit and parse JSON payloads with json_encode/decode and parse XML with SimpleXMLElement.

Synthesize all PHP skills: build a complete secure user registry, validation pipeline, and JSON API engine.