Iterables

Iterable is a built-in compile-time type alias for array|Traversable. From its introduction in PHP 7.1.0 and prior to PHP 8.2.0, iterable was a built-in pseudo-type that acted as the aforementioned type alias and could be used as a type declaration. An iterable type can be used in foreach and with yield from within a generator.

Note:

Functions declaring iterable as a return type may also be generators.

Example #1 Iterable generator return type example

<?php
function gen(): iterable {
 yield 1;
 yield 2;
 yield 3;
}
foreach(gen() as $value) {
 echo $value, "\n";
}
?>

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