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<?php $langs = [ 5 => "english", 10 => "french", 12 => "german" ]; $posts = [ [ "date" => "13-07-2022", "lang_id" => 5, "amount" => 90, ], [ "date" => "13-07-2022", "lang_id" => 10, "amount" => 34, ], [ "date" => "14-07-2022", "lang_id" => 5, "amount" => 7, ], ]; $defaults = array_fill_keys($langs, 0); $result = []; foreach ($posts as $row) { extract($row); $result[$date] ??= ['date' => $date] + $defaults; $result[$date][$langs[$lang_id]] += $amount; } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'date' => '13-07-2022', 'english' => 90, 'french' => 34, 'german' => 0, ), 1 => array ( 'date' => '14-07-2022', 'english' => 7, 'french' => 0, 'german' => 0, ), )

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