Online PHP editor | refs for JAtNU

<?php $array = [ ['id[0]' => 'BX-78', 'Name[0]' => 'XXX', 'Address[0]' => 'YUUSATD'], ['id[1]' => 'BX-79', 'Name[1]' => 'YYY', 'Address[1]' => 'DHJSHDJGY'], ['id[2]' => 'BX-80', 'Name[2]' => 'ZZZ', 'Address[2]' => 'DDSDSDA'], ['id[3]' => 'BX-78', 'Name[3]' => 'AAA', 'Address[3]' => 'FSDSDS'], ['id[4]' => 'BX-81', 'Name[4]' => 'XXX', 'Address[4]' => 'DSDSDSD'] ]; $dupes = []; $current = []; foreach ($array as $index => $entry) { $idKey = "id[$index]"; $nameKey = "Name[$index]"; if (array_key_exists($entry[$idKey], $current)) { $dupes[] = [$entry, $current[$entry[$idKey]]]; } elseif (array_key_exists($entry[$nameKey], $current)) { $dupes[] = [$entry, $current[$entry[$nameKey]]]; } else { $current[$entry[$idKey]] = $current[$entry[$nameKey]] = $entry; } } print_r($dupes);