PHP
A server-side scripting language that powers a huge share of the web.
1. Introduction to PHP
A server-side language that runs before the page reaches the browser, and why that matters for what PHP can and can't do.
2. Variables
PHP variables always start with a dollar sign, and don't need a declared type.
3. Echo & String Concatenation
Joining strings together with the dot operator, PHP's own way of building combined output.
4. Operators
Arithmetic, comparison, and logical operators, including the stricter three-equals comparison.
5. Conditionals
Branching with if, elseif, and else, familiar C-family syntax with curly braces.
6. Loops
Repeating code with for, while, and foreach, PHP's dedicated tool for stepping through arrays.
7. Functions
Defining reusable logic with the function keyword.
8. Arrays
Indexed and associative arrays, and how foreach steps through either kind.