Solved

Trying to validate a form with the number 0

Posted on 2009-04-06
3
149 Views
Last Modified: 2013-12-12
I have a form and a validation script to insert the data. I want to allow the user to enter the values 0,1,2, or 3. If a user enters 0 as a value, they get an error that nothing has been entered. How do i allow 0's to be entered?
Sample of the form 
 

<li>

              <label for="WoodFrog">Wood Frog</label>

              <input name="WoodFrog" type="text" value="<?php if(isset($_POST['WoodFrog'])); ?>" />

</li>
 
 

sample of the validation script
 

if(empty($_POST['WoodFrog']))

		{

			$errors[] = 'You forgot to enter the number of Wood Frogs.';

		}

		else 

		{

			if($_POST['WoodFrog'] == 0 OR $_POST['WoodFrog'] == 1 OR $_POST['WoodFrog'] == 2 OR $_POST['WoodFrog'] == 3)

			{

				$woodFrog = trim($_POST['WoodFrog']);

			}

			else

			{

				$errors[] = 'You entered an invalid number for Wood Frog';

			}

		}

Open in new window

0
Comment
Question by:toymachiner62
  • 2
3 Comments
 
LVL 19

Expert Comment

by:NerdsOfTech
ID: 24084080
empty(0) returns true USE isset instead

empty() reference:
http://us2.php.net/empty 
Sample of the form 

 

<li>

              <label for="WoodFrog">Wood Frog</label>

              <input name="WoodFrog" type="text" value="<?php if(isset($_POST['WoodFrog'])); ?>" />

</li>

 

 

sample of the validation script

 

if(isset($_POST['WoodFrog']))

                {

                        $errors[] = 'You forgot to enter the number of Wood Frogs.';

                }

                else 

                {

                        if($_POST['WoodFrog'] == 0 OR $_POST['WoodFrog'] == 1 OR $_POST['WoodFrog'] == 2 OR $_POST['WoodFrog'] == 3)

                        {

                                $woodFrog = trim($_POST['WoodFrog']);

                        }

                        else

                        {

                                $errors[] = 'You entered an invalid number for Wood Frog';

                        }

                }

Open in new window

0
 
LVL 19

Accepted Solution

by:
NerdsOfTech earned 250 total points
ID: 24084100
or better yet use is_null()

http://us2.php.net/manual/en/function.is-null.php
Sample of the form 

 

<li>

              <label for="WoodFrog">Wood Frog</label>

              <input name="WoodFrog" type="text" value="<?php if(isset($_POST['WoodFrog'])); ?>" />

</li>

 

 

sample of the validation script

 

if(is_null($_POST['WoodFrog']))

                {

                        $errors[] = 'You forgot to enter the number of Wood Frogs.';

                }

                else 

                {

                        if($_POST['WoodFrog'] == 0 OR $_POST['WoodFrog'] == 1 OR $_POST['WoodFrog'] == 2 OR $_POST['WoodFrog'] == 3)

                        {

                                $woodFrog = trim($_POST['WoodFrog']);

                        }

                        else

                        {

                                $errors[] = 'You entered an invalid number for Wood Frog';

                        }

                }

Open in new window

0
 
LVL 2

Author Closing Comment

by:toymachiner62
ID: 31567353
is_null() works great. Thanks
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Introduction HTML checkboxes provide the perfect way for a web developer to receive client input when the client's options might be none, one or many.  But the PHP code for processing the checkboxes can be confusing at first.  What if a checkbox is…
Generating table dynamically is the most common issue faced by php developers.... So it seems there is a need of an article that explains the basic concept of generating tables dynamically. It just requires a basic knowledge of html and little maths…
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.

895 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

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now