PHP supports ten primitive types.
| Type | Desc | Example |
|---|---|---|
| Integers | Numbers | 1999, 100 |
| Float | floating-point numbers. | 3.1415926 |
| Booleans | either true or false | TRUE,FALSE |
| NULL | special type | NULL |
| Strings | series of characters | "hello php" |
| Arrays | an ordered map | array('key'=>'value') |
| Iterables | Iterable is a pseudo-type | |
| Objects | are instances of programmer-defined classes | $bar = new foo; |
| Resources | A resource is a special variable, holding a reference to an external resource. (ie,mysql connections) |
|
| Callbacks / Callables | Some functions accept user-defined callback functions as a parameter |