php - Split data without delimiter? -

ok have phone numbers stored in table as:

"0008675309"

i wouldn't want display that, i'd want format when call as:

(000)867-5309

would better store in database delimiter such / - or . can split later? or possible split number of characters?

here 1 liner want:

$phone = preg_replace('^(\d{3})(\d{3})(\d{4})$', '($1)$2-$3', $phone); 

as added bonus won't change format if input format doesn't match (international numbers).