you can do either:
ereg:
if(isset($field) and !$field!='') { // first check if it was submitted at
all,
// you'll get errors if it isn't there
$res = False;
$field = trim($field); // trim it to remove any whitespaces
// way 1, ereg:
if(ereg(^[[:digit:]]$, $field)) { $res = True; }
// way 2, is_numeric() (the best, fastest way):
if(is_numeric($field)) { $res = True; }
// way 3, is_int() (the same):
if(is_int($field)) { $res = True; }
// way 4, is_num() (the same):
if(is_int($field)) { $res = True; }
// way 5, gettype() (the same):
if(gettype($field)=='integer') { $res = True; }
// way 6, a stupi one but works
if($field0) { $res = True; }
}
as you can see there are several ways to do it.
use wchich suits you better. In fact I would rather use JavaScript in form,
and here.
my favorite? is_int(). shorter to type :-)
Sincerely,
Maxim Maletsky
Founder, Chief Developer
PHPBeginner.com (Where PHP Begins)
[EMAIL PROTECTED]
www.phpbeginner.com
-Original Message-
From: Jamie Saunders [mailto:[EMAIL PROTECTED]]
Sent: Friday, April 27, 2001 11:39 PM
To: [EMAIL PROTECTED]
Subject: [PHP] simple form validation
Hi,
First of all, I've just joined this list, so here's a brief
introduction. My name's Jamie Saunders, I'm an 18 year old student from
the UK studying for my A-Levels. I'm currently working on a Computer
Studies project for a local business which involves setting up several
databases on the web. After reading Webmonkey.com's excellent introduction
to PHP I've decided to use it in conjunction with MySQL for the
project. Later this year, if all goes well I'm hoping to take a 3 years BA
Honors course in Multimedia Web Production.
Right, you still with me? What I'd like to know is how to validate a text
field in an HTML form to make sure it only contains numbers. I know how to
check it so it only contains letters, but not numbers - the field I want to
check is for phone numbers - so it can't contain any special characters
either. I expect this is very simple but I can't seem to get it working
properly. Any help appreciated.
Cheers,
Jamie Saunders
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