Form Valid

[MrLister]

I'm not sure how to make it so when somebody submits a form if the form has a empty field it says that they didn't fill it in and it won't be updated. can somebody help me on that plz.

[RKuhle]

I always create a hidden field called form:
<input type="hidden" name="form" value="1">

Then at the end of the script I do this:

if($form)
{
 // If form was submitted, check for errors and submit to database
  errorCheck();
  databaseEntry();
}
else
{
 // Else print form
 printForm()
} 

Then, errorCheck() looks something like this:

function errorCheck()
{
 global $adcopy;
        if (empty($adcopy))
        {
            $errormsg .= "<li><font color=red>No ad copy specified.</font><br>\n";
            $error = 1;
        }
        
        if ($error)
        {
        printHeader("$sitetitle - Error Adding New Member", "Error Adding New Member");
        ?>
        
        The following errors have occurred while processing your request:<br>
        <ul>
        <?php print $errormsg; ?>
        </ul>
        <p>
        Please press the back button on your browser and submit the member information again.  Thank you.
        <p>
        
        <?php
        printFooter();   
        
        exit;
        }

[drisley]

The key to the function is to use the empty() function to see if the variable is defined.

if (empty($var)) {
echo "this";
}

Just put that into your form processor.