Online PHP editor | refs for NmK3V

<?php $input = [ [ 'Standort' => '', 'Letzte Meldung' => '', 'On-/Offline seit' => '04.05.2022 11:03', 'Online' => '', ], [ 'Standort' => 'Schweiz', 'Letzte Meldung' => '', 'On-/Offline seit' => '11.02.2022 14:59', 'Online' => '', ] ]; $keep = []; array_walk_recursive($input, function($v, $k) use(&$keep) { if (strlen($v)) { $keep[$k] = null; } }); var_export( $keep ? array_map(fn($row) => array_intersect_key($row, $keep), $input) : [] );