PHP defines 8 different variable types. These are outlined here for your quick reference. Be familiar with each of the different types and how they may be used in your programming.
| Data Type | Description |
Boolean | A logical datatype with only two distinct possible values: true and false |
Integer | A numeric value in the form of a whole number. A whole number has no fractional parts (or decimal point). |
Float | A floating point or real number. This number is in the format -35.2357 |
String | A string is an ordered sequence of characters. A character may be any unicode character your computer may display. |
| Data Type | Description |
Array | An array is an indexed list of items. In PHP, arrays may be indexed by number (a regular array) or by strings (an associative array) |
Object | An object is an instance of a class that contains member variables and methods. Data and method implementations are encapsulated and hidden from the user to simplify development and maintain the integrity of the system. |
| Data Type | Description |
Resource | A special operating system specific piece of data. This may correspond to a database connection, an image resource or a filesystem context |
Null | Null is a special value that is assigned to a variable to indicate that the variable holds no valid data. |
