I'm a newbie in PHP, I use this PHP code that works like a charm. It's a custom form that sends to Woocommerce different fields. I want to add a "preg_match" check for each of those fields so the user can only enter:
$address = array( 'first_name' => $first_name, 'last_name' => $last_name, 'company' => '', 'email' => $email, 'phone' => $phone, 'address_1' => $street, 'city' => $city, 'state' => '', 'postcode' => $postcode, 'country' => $country, );
In the telephone field: numbers, "+", spaces; (22 burns absolute) In the postcode field: postcodes are contained in a custom post type "Structures" with their titles as values. Just those qualities. How would I do that?