Online PHP editor | refs for IUB6E

<?php function ReformatPhoneNumber($number) { if (!IsValidNumber($number)) { throw new \Exception('Invalid phone number'); } echo $number; } function IsValidNumber($number) { $validChars = array(' ', '-'); if (!is_numeric(substr($number, 0, 1)) || !is_numeric(substr($number, strlen($number) - 1, 1)) ) { return false; } $delimiterFlag = false; foreach (str_split($number) as $digit) { if (!is_numeric($digit) && !in_array($digit, $validChars)) { return false; } if (in_array($digit, $validChars)) { if ($delimiterFlag) { return false; } $delimiterFlag = true; } else { $delimiterFlag = false; } } return true; } echo ReformatPhoneNumber('012-345 69');