Special Types¶

PHP defines some special types.

mixed: any type
void: no returned value
callable: may be used as a callback
iterable: may be used with foreach(), including array
never: never returns
object: object of any class
parent: any of the parent class of the current class, excluding it
self: the current class
static: the current called class

Other special types are the scalar types.

<?php

    function foo(iterable $i) : never {
        foreach ($i as $j) {
            echo $j;
        }

        die();
    }

?>

See also An Exhaustive Guide to Understanding and Using PHP Data Types.

Related : Type System, Type System, Mixed, Void, Callables, Iterable, Never Type, Object, parent, static, Self

Added in PHP 7.0