Concatenating Strings the Wrong Way

Inspecting Values With var_dump

Basic Data Types

Type Juggling and Automatic Conversion

Variable Naming and Case Sensitivity

Comparison Operators: Loose vs Strict

PHP Opening and Closing Tags

Interpolation in Double vs Single Quotes

Constants With define() and const

Variable Declaration and the $ Sign

Basic Arithmetic Operators

Embedding PHP Within HTML

Echo and Print for Output

Assignment Operators

Statement Termination With Semicolons

Single and Multi-line Comments

Case Sensitivity Rules in PHP

Comments in PHP

PHP Statements and Semicolons

Your First PHP Script: echo and print

PHP Opening and Closing Tags

PHP Files and Embedding in HTML

PHP in the Request-Response Cycle

The Evolution of PHP

What PHP Is and Its Purpose

What Is PHP?

PHP Tags in HTML

Constants vs Variables

Writing Comments

Basic Scalar Types

Dynamically Typed PHP

Outputting With Echo

Variable Naming Rules

String Concatenation

Declaring Variables

Statement Termination

Single vs Double Quotes

PHP File Execution

Arithmetic and Assignment

Common PHP Use Cases

PHP File Extension

Case Sensitivity Rules

Statements and Semicolons

Whitespace and Formatting

What PHP Is

PHP Tags and HTML

echo and print

Comments in PHP

PHP Is Interpreted

Where PHP Is Used Today

Is PHP Interpreted or Compiled?

Setting Up a PHP Environment