<?php$in = [ '2,24', '2,2,9,12'];$out = [];foreach($in as $item) { $norm = explode(',', $item); $ar = array_count_values($norm); $pos = []; $out[] = &$pos; array_walk($ar, function ($val, $key) use(&$pos) { if($val > 1) { $pos[] = $key . '(' . $val . ')'; } else { $pos[] = $key; } }); unset($pos);}foreach($out as $listItem) { echo implode(',', $listItem) , PHP_EOL;}
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