Req #70364 [Com]: foreach type hinting

Edit report at https://bugs.php.net/bug.php?id=70364&edit=1 ID: 70364 Comment by: eliasvo at gmail dot com Reported by: untuned20 at gmail dot com Summary: foreach type hinting Status: Open Type: Feature/Change Request Package: Scripting Engine problem PHP Version: Irrelevant Block user comment: N Private report: N New Comment: I, for one, don't see the need for typed language constructs (heck, even languages like C++ have introduced the auto keyword because iterating over complex types was getting way to verbose). However, if this is something that is going to be implemented, there should be more thought put into this. Things to consider: - What is the expected behaviour if the type constraint is not met (catchable fatal, exception, warning, notice, ...?) - What about allowing multiple types? Do we need to introduce the vague mixed type-hint? - Scalars... do we implement type-hints for the keys, too (foreach ($array as int $key => string $value)) - If key type-hints are made possible, what do they do: the int $key hint should only allow numeric indexes or b) should skip over any key that is not numeric c) convert numeric strings to ints <- should this change the hashtable we're iterating over (probably not), but it might cause issues later on if it doesn't Tl;tr This request needs a lot more thought put into it, but really, there's no need as there are plenty of other ways to achieve this already: array_map($instanceList, function (MyClass $instance) { //element is guaranteed to be instance of MyClass here }); Previous Comments: ------------------------------------------------------------------------ [2015-09-03 01:52:03] untuned20 at gmail dot com I am seeing that php is trying to get more and more into type hinting, and that it would be nice to have type hinting in foreach loops as well as in functions. Not only would it give the same functionality as when declaring a function, but it would also allow IDE's to autocomplete nicely. ------------------------------------------------------------------------ [2015-09-03 01:37:28] yohgaki@php.net @untuned20 Do you have problem with foreach($classList as $class) { assert($class instanceof MyClass); } or something like this? ------------------------------------------------------------------------ [2015-08-26 16:21:23] untuned20 at gmail dot com Description: ------------ Allow for the ability to type hint a foreach loop. Test script: --------------- <?php $classList = [/* List of classes */]; foreach($classList as $index => MyClass $class){} foreach($classList as MyClass $class){} class MyClass{ /* Methods and Properties */ } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70364&edit=1