What are the different types of variables in PHP?

In PHP, variables are categorized based on their data types. Here are the main types:

1. Integer: Whole numbers without a decimal point. E.g., $age = 25;

2. Float (or Double): Numbers with a decimal point. E.g., $price = 19.99;

3. String: A sequence of characters. E.g., $name = "John";

4. Boolean: Represents either true or false. E.g., $isLoggedIn = true;

5. Array: A collection of values. Can be indexed or associative. E.g., $colors = array("red", "green", "blue");

6. Object: An instance of a class, containing properties and methods. E.g., $car = new Car();

7. NULL: Represents a variable with no value. E.g., $var = NULL;

8. Resource: A special type used to hold references to external resources (like database connections). E.g., $conn = mysqli_connect("localhost", "user", "password");

These types cover most of the data you'll work with in PHP.