<?php $s = "12345"; $res = []; if (preg_match_all('~(?=((\d)\d?))~', $s, $m, PREG_SET_ORDER)) { $single = []; $double = []; foreach ($m as $v) { if ($v[1] != $v[2]) { array_push($single, $v[2]); array_push($double, $v[1]); } else { array_push($single, $v[1]); } } $res = array_merge($single, $double); print_r( $res ); }
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