[TriLUG] PHP is_null is driving me in_sane

[Greg Brown]

You're right!  Yo da man!

Greg

On Jan 25, 2005, at 9:24 AM, David Rasch wrote:

> 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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