PHP Syntax & Variables

Learn the fundamental syntax of PHP including variables, data types, and basic operations.

Variables

PHP variables start with the $ symbol:

<?php
$name = "John";
$age = 25;
$price = 19.99;
$isActive = true;
?>

Data Types

• String
• Integer
• Float
• Boolean
• Array
• Object
• NULL

String Concatenation

<?php
$firstName = "John";
$lastName = "Doe";
$fullName = $firstName . " " . $lastName;
echo $fullName; // Output: John Doe
?>