validating a form with regular expressions

[jzamora881]

I have a form that has the following text fields

Guest Number
Zip
Phone Number
Date of Last Stay
Date of Reservation
Confirmation Number
Social Security Number

the fields must be validated with the following criteria:

1. Guest Number Must be all numeric (No More than 7)
2. Zip Must be nnnnn-nnnn (n must be 0-9)
3. Phone Number must be nnn.nnn.nnnn
   4.Date of Last Stay must be mm/dd/yyyy
   (mm = 01-12, dd = 01-31 yyyy= 2000-2002)
4. Date of Reservation Must be yy-mm-dd
   (mm = 01-12, dd = 01-31 yy= 00-02
5. Confirmation Number must be xxxXXXnn
   (xxx is 3 lower case a-z) (XXX is three upper case A-Z)
   (nn is two numeric 0-9)
6. Social Security Number nnn-nn-nnnn (n's are 0-9)

I believe i have the form set up properly I set up each field as an Array and I guess I have pass each value to a varialble then validate that variable...not sure quite how to code the PHP program though, help would be much appreciated
😃

[Weedpacket]

Something like

$error_message='';
if(empty($_POST['guest_no'])
{ $error_message .= 'No number of Guest number. ';
}
elseif(!is_numeric($_POST['guest_no'] || $_POST['guest_no']<0 || $_POST['guest_no']>7)
{ $error_message .= 'Guest number out of range. ';

if(empty($_POST['zip_no'])
{ $_POST['zip_no']=''; // Zip is optional
}
elseif(!preg_match('/\d{5}-\d{4}/', $_POST['zip_no']))
{ $error_message .= 'Zip number invalid. ';

//etc.etc.

if($error_message=='')
{ //Form successfully validated
}
else
{ // Form invalid. $error_message sez wot's wrong
}

preg_match('/(\d\d)-(\d\d)-(\d\d)/', $date, $bits)
will match yy-mm-dd, with $bits[1]..$bits[3] being the - well, the pairs of digits in question. check_date() can be used to see if it's valid (Eg., 03-02-29 is not).

One thing I don't understand is why date of last stay and date of reservation are in different formats.