Variables and Data Types in PHP

Variables store data. In PHP, they always start with a $ sign.

Creating variables

<?php
$name = "John";
$age = 25;
$isStudent = true;
?>

Common data types

• string: "Hello"
• integer: 10
• float: 3.14
• boolean: true / false
• array: list of values
• null: no value

Using variables

<?php
echo "My name is $name and I am $age years old.";
?>

PHP replaces variables inside double quotes.

Type checking

var_dump($age);

Shows type and value.

Next: Operators and basic math in PHP.