php Data Types

PHP supports the following basic data types

  • Integer—Used for whole numbers
  • Float (also called double)—Used for real numbers
  • String—Used for strings of characters
  • Boolean—Used for true or false values
  • Array—Used to store multiple data items
  • Object—Used for storing instances of classes

Three special types are also available: NULL, resource, and callable.

Variables that have not been given a value, have been unset, or have been given the specific value NULL are of type NULL.

Certain built-in functions (such as database functions) return variables that have the type resource. They represent external resources (such as database connections). You will almost certainly not directly manipulate a resource variable, but frequently they are returned by functions and must be passed as parameters to other functions.

Callables are essentially functions that are passed to other functions

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