<?php function parseX($string) { $array = is_string($string) ? str_split($string) : $string; if (!in_array("X" , $array)) { return [$string]; } $ret = []; $key = array_search('X' , $array); for($i = 0 ; $i < 10; $i++) { $array[$key] = $i; $ret = array_merge($ret , parseX(implode('' , $array))); } return $ret; } var_dump(parseX("XX"));
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