Online PHP editor | refs for hJnmQ

<?php $arr = [ ['1', 'a'], ['2', 'b'], ['3', 'c'], ['3', 'd'], ['2', 'e'], ['3', 'f'], ['2', 'g'], ['3', 'h'], ['1', 'i'], ['2', 'j'], ['3', 'k'], ]; $savedLevelOne = null; $savedLevels = []; $prevLevel = null; foreach ($arr as $arrItem) { [$level, $value] = $arrItem; if ($level !== '3' && $prevLevel === '3') { var_dump([$savedLevelOne, ...$savedLevels]); $savedLevels = []; } if ($level === '1') { $savedLevelOne = $value; } else { $savedLevels[] = $value; } $prevLevel = $level; } var_dump([$savedLevelOne, ...$savedLevels]);