需要在PHP Formmail脚本中重新格式化电话号码条目

$phone = "123-456-7890";
$formatted_phone = preg_replace("/^(\d{3})-(\d{3})-(\d{4})$/", "$1-$2-$3", $phone);

$phone = "1234567890";
$formatted_phone = substr($phone, 0, 3) . '-' . substr($phone, 3, 3) . '-' . substr($phone, 6);

$phone = "123-456-7890";
$formatted_phone = str_replace('-', '', $phone);