<?php $chars = '6Ata7~58jh&*(*HLy^)&a[yjJ>8]G8,$9<Y;B:%^'; $lookup = array_fill_keys(range('a', 'z'), 0) + array_fill_keys(range('A', 'Z'), 1) + array_fill_keys(range(0, 9), 2); $array = str_split($chars); usort($array, fn($a, $b) => ($lookup[$a] ?? 3) <=> ($lookup[$b] ?? 3)); echo implode($array);
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