Solved

PHP  simple comparison (validation) question

Posted on 2008-06-18
4
233 Views
Last Modified: 2010-04-21
I have a web form input text field where i want the user to enter a 5 digit zipcode.
What is the best way (in php, not JS) to make sure it's 5 digits 0-9
I've tried  < and > comparisons, but characters evidently get converted to integers and some short strings can fall within the 0-99999 range.

thanks
0
Comment
Question by:willsherwood
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 24

Accepted Solution

by:
glcummins earned 167 total points
ID: 21814616
There are a number of PHP ZIP code validation scripts available, which helps you to avoid reinventing the wheel. One common one is here:

http://www.hotscripts.com/Detailed/46060.html
0
 
LVL 82

Assisted Solution

by:hielo
hielo earned 167 total points
ID: 21814619
assuming the name of your field is zipcode:
if( preg_match('/^\d\d\d\d\d([-]\d\d\d)?$/', $_REQUEST['zipcode']) )
{
 $zip = $_REQUEST['zipcode'];
 echo "$zip  is valid";
}
0
 
LVL 48

Assisted Solution

by:hernst42
hernst42 earned 166 total points
ID: 21814627
try to validate:

if (!preg_match('/^\d{5}$/', $zipcodeToValidate) {
 // invalid zip code
}
0
 

Author Closing Comment

by:willsherwood
ID: 31468445
thanks to you all.  (simultaneously)
0

Featured Post

Enroll in June's Course of the Month

June’s Course of the Month is now available! Experts Exchange’s Premium Members, Team Accounts, and Qualified Experts have access to a complimentary course each month as part of their membership—an extra way to sharpen your skills and increase training.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article discusses how to create an extensible mechanism for linked drop downs.
3 proven steps to speed up Magento powered sites. The article focus is on optimizing time to first byte (TTFB), full page caching and configuring server for optimal performance.
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

729 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question