PHP Variables

Variables in PHP start with $ followed by the name. They are dynamically typed.

Basic Syntax

$name = "John";         // String
$age = 25;              // Integer
$price = 19.99;         // Float
$is_active = true;      // Boolean

Naming Rules

• Start with $ followed by a letter or underscore
• Case-sensitive ($name ≠ $Name)
• Use descriptive names in camelCase or snake_case

Variable Scope

• Global — Declared outside functions
• Local — Declared inside functions
• Static — Retains value between function calls

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