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<?php $data = [ 0 => [ "record_id" => 3, "task_date" => "2018-10-02" ], 1 => [ "record_id" => 5, "task_date" => "2018-10-02" ], 2 => [ "record_id" => 1, "task_date" => "2018-09-27", ] ]; $out = []; foreach($data as $task) { $out["task_date"][] = $task; } var_dump(array_values($out)) ;

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