Online PHP editor | output for 99NV4

<?php function uniqueNoEmpty($array) { return array_unique(array_filter($array, 'strlen')); } $original_string = 'one two three 喞喝 four 刷囿 two 跏正吁'; if (!preg_match_all('~(\p{Han}+)|(\S+)~u', $original_string, $out)) { echo 'no qualifying strings'; } else { $singleBytes = uniqueNoEmpty($out[2]) ?? []; $multiBytes = array_reverse(uniqueNoEmpty($out[1])); echo implode(' ', array_merge($singleBytes,$multiBytes)); }