Online PHP editor | refs for AkshS

<?php declare(strict_types=1); error_reporting(-1); ini_set('display_errors', 'On'); $array = [ 'Alex' => [ [ ['event' => 'eventName1'],['event' => 'eventName2'] ], [ ['event' => 'eventName3'],['event' => 'eventName4'] ], [ ['event' => 'eventName5'],['event' => 'eventName6'] ], [ ['event' => 'eventName7'],['event' => 'eventName8'] ], [], [], [] ], 'christoper'=>[ [],[],[],[],[],[],[] ] ]; $output = array_filter($array, function (array $studentDays) { foreach ($studentDays as $day) { if (! empty($day)) { return true; } } return false; }); print_r($output);