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<?php $array = [ 'attractions' => collect([ [ 'id' => 1, 'region' => 'Ivan', ], [ 'id' => 2, 'region' => 'Ivan', ], [ 'id' => 3, 'region' => 'Lenin', ], ]), 'trips' => collect([ [ 'id' => 3, 'region' => 'Ivan', ], [ 'id' => 4, 'region' => 'Ivan', ], ]), ]; $collection = collect($array); // $grouped = $collection['attractions']->mapToGroups(function ($item, $key) { // return [$item['region'] => $item]; // }); var_export($collection);
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