Online PHP editor | refs for BmESHk

<?php $array = [ ["day1" => 1, "day2" => 1, "name" => "Ram"], ["day1" => 1, "day2" => 2, "name" => "Raj"], ["day1" => 1, "day2" => 3, "name" => "Rahul"], ["day1" => 2, "day2" => 3, "name" => "Rocky"] ]; foreach ($array as &$row) { $day1 = min($day1 ?? $row['day1'], $row['day1']); $day2 = max($day2 ?? $row['day2'], $row['day2']); $row['day1'] = &$day1; $row['day2'] = &$day2; } var_export($array);