Online PHP editor | refs for JE5r8

<?php mb_regex_encoding('SJIS'); $string = "my number is 63735"; $pattern = "63735"; $packed = pack('n', "63735"); //before convert to ASCII: f8f7 var_dump(bin2hex($packed)); $replacement = mb_convert_encoding($packed, "SJIS", "ASCII"); //after convert to ASCII: 3f8180 var_dump(bin2hex($replacement)); //after converting back to SJIS: var_dump(bin2hex(mb_convert_encoding($replacement, "UTF-8", "SJIS"))); //expected result: my number is �� //OK $new_string = mb_ereg_replace($pattern, $replacement, $string); //expected result: my new number is �� //but it returns NULL. $ret = mb_ereg_replace("number", "new number", $new_string); var_dump($ret); var_dump(mb_convert_encoding($ret, "UTF-8", "SJIS"));