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function format_phone($phone)
{
$phone = preg_replace("/[^0-9]/", "", $phone);

if(strlen($phone) == 7)
return preg_replace("/([0-9]{3})([0-9]{4})/", "$1-$2", $phone);
elseif(strlen($phone) == 10)
return preg_replace("/([0-9]{3})([0-9]{3})([0-9]{4})/", "($1) $2-$3", $phone);
else
return $phone;
}

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