Online PHP editor | refs for 9gWFd

<?php $array = [ ["d" => "7 Apr 2024", "s" => "pm", "i" => "el"], ["d" => "8 Apr 2024", "s" => "am", "i" => "mn"], ["d" => "12 Apr 2024", "s" => "pm", "i" => "mr"], ["d" => "12 Apr 2024", "s" => "am", "i" => "mr"], ["d" => "12 Apr 2024", "s" => "am", "i" => "da"], ["d" => "13 Apr 2024", "s" => "pm", "i" => "li"], ["d" => "14 Apr 2024", "s" => "am", "i" => "li"], ["d" => "15 Apr 2024", "s" => "mid", "i" => "nd"], ["d" => "15 Apr 2024", "s" => "pm", "i" => "da"] ]; $result = []; foreach ($array as ['d' => $d, 's' => $s, 'i' => $i]) { if (!isset($result[$d][$s])) { $result[$d][$s] = $i; } else { $result[$d][$s] .= ',' . $i; } } var_export($result);