note 118172 added to function.array-map

You may be looking for a method to extract values of a multidimensional array on a conditional basis (i.e. a mixture between array_map and array_filter) other than a for/foreach loop. If so, you can take advantage of the fact that 1) the callback method on array_map returns null if no explicit return value is specified (as with everything else) and 2) array_filter with no arguments removes falsy values. So for example, provided you have: <?php $data = [ [ "name" => "John", "smoker" => false ], [ "name" => "Mary", "smoker" => true ], [ "name" => "Peter", "smoker" => false ], [ "name" => "Tony", "smoker" => true ] ]; ?> You can extract the names of all the non-smokers with the following one-liner: <?php $names = array_filter(array_map(function($n) { if(!$n['smoker']) return $n['name']; }, $data)); ?> It's not necessarily better than a for/foreach loop, but the occasional one-liner for trivial tasks can help keep your code cleaner. ---- Server IP: 72.52.91.14 Probable Submitter: 46.5.130.76 ---- Manual Page -- http://php.net/manual/en/function.array-map.php Edit -- https://master.php.net/note/edit/118172 Del: integrated -- https://master.php.net/note/delete/118172/integrated Del: useless -- https://master.php.net/note/delete/118172/useless Del: bad code -- https://master.php.net/note/delete/118172/bad+code Del: spam -- https://master.php.net/note/delete/118172/spam Del: non-english -- https://master.php.net/note/delete/118172/non-english Del: in docs -- https://master.php.net/note/delete/118172/in+docs Del: other reasons-- https://master.php.net/note/delete/118172 Reject -- https://master.php.net/note/reject/118172 Search -- https://master.php.net/manage/user-notes.php