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Trying to validate a form with the number 0

Posted on 2009-04-06
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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';
			}
		}

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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';
                        }
                }

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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';
                        }
                }

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0
 
LVL 2

Author Closing Comment

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