[TriLUG] PHP is_null is driving me in_sane

[David Rasch]

You really want to use "empty" since a blank submission of a field does
not set it to "null", but rather doesn't set it.  So you could change
your conditional "is_null" to "empty" and you should get the desired
result.

David


On Tue, Jan 25, 2005 at 09:20:04AM -0500, Greg Brown <gregbrown at mindspring.com> wrote:
> Grrr.... okay, I am trying a simple function in PHP.  I am passing four 
> variables, first name, last name, e-mail, and phone number to the PHP 
> script.  The PHP function is_null simply refuses to figure out that a 
> required field, $firstName is empty.  So, is there a better way to do 
> this?  Say, perhaps, a regular expression that figures out there are no 
> alphanumeric characters or something?
> 
> Here's a code snippet:
> 
> <?php
> 
> /* now let's get the variables passed to the script */
>         $firstName=trim($HTTP_POST_VARS['fname']);
>         $lastName=trim($HTTP_POST_VARS['lname']);
>         $email=trim($HTTP_POST_VARS['email']);
>         $phone=trim($HTTP_POST_VARS['phone']);
> 
>         // echo "<P>$firstName<br>";
>         // echo "$lastName<br>";
>         // echo "$email<br>";
>         // echo "$phone<br>";
> 
>         /* now let's test to see if anything was left empty that
>            should not have been */
> 
>         /* create a function to handle the error message */
>         function writeError($a) {
> 
>                 echo "It appears you have forgotten to enter the 
> required field of: $a<b
> r>";
>                 echo "Please re-enter the data<p>";
> 
>         }
> 
>         if (is_null($firstName)) {
> 
>                 $errorReturn = writeError("First Name");
> 
>         }
> 
>         else {
> 
>                 //code processing goes here
> 
>         }
> 
> ?>
> 
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