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<?php function ReformatPhoneNumber($number) { if(strlen($number) > 12 || strlen($number) < 7) throw new Exception("Invalid phone number"); if(preg_match('/^\d+(\d-\d)?\d*(\d\s\d)?\d+$/', $number) === 1) return str_replace(array('-', ' '), '', $number); } echo ReformatPhoneNumber('012345');

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