<?php $data = [[ "continent" => "Europa", "country" => "France", "capital" => "Paris", ],[ "continent" => "Europa", "country" => "Spain", "capital" => "Madrid", ],[ "continent" => "Asia", "country" => "Russia", "capital" => "Moscow", ]]; $groupByContinent = function(array $list) { return array_reduce($list, function($grouped, $item) { $grouped[$item['continent']][] = $item; return $grouped; }, []); }; $groupedByContinent = $groupByContinent($data); var_dump($groupedByContinent);
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Value for `_results` contains invalid data `array`