Can you list the main types of data used in PHP?

Main types of data in PHP:

• Integer — whole numbers, for example: 1, -10, 100
• Float (double) — floating-point numbers, for example: 3.14, -0.01
• String — sequences of characters, for example: "Hello"
• Boolean — logical values: true or false
• Array — ordered or associative collections
• Object — class instances
• NULL — a special value indicating the absence of a value
• Resource — special variables referencing external resources (e.g., database connections)

PHP is dynamically typed, so a variable can change its type during execution.