Week 2 Assignment — Variables & Data Types (PHP CLI) Title: Hello Variables Due Date: Sept 3, 2025 Goal Practice basic PHP variables, concatenation, and simple arithmetic in the command line. Instructions Beginner (Full Credit) Create a file week2.php that: Defines a string variable with your name (e.g., $name = "Alex";). Prints a concatenation of "Hello world, " and your variable. Example output: Hello world, Alex Defines two number variables (e.g., $a = 7; $b = 5;). Prints the sum of those two numbers. Example output: The sum of 7 and 5 is 12 Advanced (Optional) Add one of the following for practice: ...