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In PHP, there are eight different variable types:
- Boolean: This variable type can only have two values, either true or false.
- Integer: This variable type is used to represent whole numbers, either positive, negative or zero.
- Float: Also known as floating-point numbers or double, this variable type is used to represent numbers with a decimal point.
- String: This variable type is used to represent a sequence of characters, enclosed in quotes, either single or double.
- Array: This variable type is used to store multiple values in a single variable. The values are stored as key-value pairs, and the keys can be either numeric or string.
- Object: This variable type is used to create instances of classes, which are used to represent real-world entities.
- Resource: This variable type is used to represent external resources, such as database connections or file handles.
- Null: This variable type is used to represent the absence of a value, and can only have one value, which is null.
