<?php
$rows = [['size' => 'XL,L,XXL'],
['size' => 'XL'],
['size' => 'M,L,XL'],
['size' => 'L,XL,M']];
// while ($srow = $result->fetch_assoc()) {
foreach ($rows as $srow) {
$sizes[] = $srow['size'];
// do other stuff with fetched data
// ...
}
$sizes = array_unique(array_map('trim', explode(',', implode(',', $sizes))));
sort($sizes);
$string = implode(',', $sizes);
echo $string;
preferences:
59.34 ms | 402 KiB | 5 Q