Just to note:
Though objects may (or may not) be Traversable, the can use in foreach because implicit conversion to array
<?php
class Foo {
public $a = 1;
public $b = "Helo";
};
$bar = new Foo;
foreach($bar as $elm) {
echo $elm . ' ';
}
?>
prints 1 Hello
Even
<?php
$bar = new stdClass
foreach($bar as $elm) {
echo $elm . ' ';
}
?>
is correct.
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 can be used as a type declaration.
An iterable type can be used in foreach and with
yield from within a
generator.
Nota:
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;
}
?>
add a note
User Contributed Notes 1 note
j_jaberi at yahoo dot com ¶
4 years ago
