I use this technique to group the bug fixes array by date in the Inspector dashboard, and I thought it could be a good code snippet idea for others. I also wrote an implementation for Laravel blade templates and a more detailed implementation that supports filtering.
I decided to implement this code because it makes a list of items so easy to scroll based on their history.
This implementation uses the array_reduce function. It allows to progressively create a new array where each date becomes a key, with the corresponding element as its value.
$data = [ ['date' => '2023-06-01', 'value' => 10], ['date' => '2023-06-02', 'value' => 20], ['date' => '2023-06-01', 'value' => 30], ['date' => '2023-06-03', 'value' => 40], ['date' => '2023-06-02', 'value' => 50], ]; $groupedData = array_reduce($data, function ($result, $item) { $date = new DateTime($item['date']); $formattedDate = $date->format('Y-m-d'); if (!isset($result[$formattedDate])) { $result[$formattedDate] = []; } $result[$formattedDate][] = $item; return $result; }, []); // <-- Start with an empty array
Thanks to the DateTime object and the format method you can customize the grouping logic by month, or year, by simply changing the format string: 'Y-m' for month, or 'Y' for year.
You can also introduce a filter function to filter the elements before grouping them by the date field.
$groupedData = array_reduce(array_filter($data, function ($item) use ($filter) { // Filter condition: keep elements with value greater than 20 return $item['value'] > $filter; }), function ($result, $item) { $date = new DateTime($item['date']); $formattedDate = $date->format('Y-m-d'); if (!isset($result[$formattedDate])) { $result[$formattedDate] = []; } $result[$formattedDate][] = $item; return $result; }, []);
Inside the callback function of array_filter(), we specify the filter condition. In this example, we keep only the elements where the ‘value’ field is greater than $filter. You can modify this condition based on your specific use case.
Obviously you can take inspiration and use the same strategy in your specific technology (like Symfony + Twig, or similar).
To keep the data manipulation statements separated from the view I keep the filtering and grouping process at the controller level, and I implement only the data structure iteration on the template side.
Here is the Controller:
namespace App\Http; use Illuminate\Http\Request; class DashboardController extends Controller { /** * The dashboard. * * @param ImpersonatesUsers $impersonator * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View */ public function index(Request $request) { $data = $this->getData(); $data = array_reduce(array_filter($data, function ($item) use ($filter) { // Filter condition: keep elements with value greater than 20 return $item['value'] > $filter; }), function ($result, $item) { $date = new DateTime($item['date']); $formattedDate = $date->format('Y-m-d'); if (!isset($result[$formattedDate])) { $result[$formattedDate] = []; } $result[$formattedDate][] = $item; return $result; }, []); return view('dashboard', compact('data')); } }
And here is the blade view:
<ul> @foreach ($groupedData as $date => $items) <li> <strong>{{ $date }}</strong> <ul> @foreach ($items as $item) <li>Value: {{ $item['value'] }}</li> @endforeach </ul> </li> @endforeach </ul>
Thanks to the builtin utilities provided by the Laravel Collection class it's really straightforward:
$groupedData = collect($data)->groupBy(function ($item) { return Carbon::parse($item->date)->format('Y-m-d'); });
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