Question

I am trying to validate a phone number and require it to have 10 digits only no spaces or special characters allowed (example: 0123456789) and the same goes with zip code except 5 digits only (example: 01234).

This is what I have for the phone number field so far.

$phone = stripslashes($_POST['phone']);

if(!$phone || $phone == "Phone Number*")
{
$error .= "Please enter your phone number.<br />";
}

The next if statement should retrieve an error similar to “Please enter a valid phone number. Example: “0123456789”.

Answer 1

If you don’t want to use regular expressions, take a look at ctype_digit

For example:

if(strlen($phone)==10 && ctype_digit($phone)) {
    //valid
} else {
    //invalid
}

I can’t testify to whether this will be faster or slower than regular expressions, but I would reckon it’s probably moot. It’s more or less what makes the most sense to you.