Concatenating Strings the Wrong Way

Comparison Operators: Loose vs Strict

Constants With define() and const

Interpolation in Double vs Single Quotes

Variable Naming and Case Sensitivity

Single and Multi-line Comments

Echo and Print for Output

PHP Opening and Closing Tags

Inspecting Values With var_dump

Assignment Operators

Basic Arithmetic Operators

Basic Data Types

Embedding PHP Within HTML

Type Juggling and Automatic Conversion

Variable Declaration and the $ Sign

Statement Termination With Semicolons

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

Constants vs Variables

Single vs Double Quotes

Arithmetic and Assignment

What Is PHP?

PHP Tags in HTML

String Concatenation

Dynamically Typed PHP

Statement Termination

Writing Comments

PHP File Execution

Outputting With Echo

Variable Naming Rules

Declaring Variables

Basic Scalar Types

echo and print

PHP File Extension

Comments in PHP

Whitespace and Formatting

Case Sensitivity Rules

Statements and Semicolons

PHP Tags and HTML

What PHP Is

PHP Is Interpreted

Common PHP Use Cases

Where PHP Is Used Today

Is PHP Interpreted or Compiled?

Setting Up a PHP Environment