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Request #71320 Extend array_map/filter to call method on each element
Submitted: 2016-01-09 15:16 UTC Modified: 2019-12-01 04:22 UTC
Avg. Score:2.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: dharkness at gmail dot com Assigned: cmb (profile)
Status: No Feedback Package: Arrays related
PHP Version: 5.6.17 OS:
Private report: No CVE-ID: None
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 [2016-01-09 15:16 UTC] dharkness at gmail dot com
I'm finding myself writing code like the following lately:

    $titles = array_map(
        function ($book) { return $book->getTitle(); },


    $anonymous = array_filter(
        function ($book) { return $book->isAnonymous(); }

I was initially thinking a new callable form word work, e.g. [null, 'methodName'], but that by itself isn't callable and would not make sense when passed to other methods that accept callable such as call_user_func. The functions would either build a real callable using each array element or simply call the method directly on it.

    $titles = array_map([null, 'getTitle'], $books);


    $anonymous = array_filter($books, [null, 'isAnonymous']);


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 [2016-01-09 15:39 UTC] dharkness at gmail dot com
After further consideration, perhaps this deserves new functions to avoid confusing the definition of a callable. They would behave just like these:

    function array_map_method(array $arr, $name) {
        return $arr 
            ? array_map(function ($object) use ($name) {
                    return $object->$name();
                }, $arr) 
            : array();


    function array_filter_method(array $arr, $name) {
        return $arr 
            ? array_filter($arr, function ($object) use ($name) {
                    return $object->$name();
            : array();

May as well add array_map_property() and array_filter_property() for completeness. :)
 [2019-11-17 16:29 UTC]
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2019-11-17 16:29 UTC]
Hmm, wouldn't the newly introduced arrow functions offer a
sensible alternative to your suggestion?  For instance,

    $titles = array_map(fn($book) => $book->getTitle(), $books);

Of course, still some boilerplate code, but a lot more flexible
since properties can be read as well, for instance.
 [2019-12-01 04:22 UTC] php-bugs at lists dot php dot net
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