CI Problem with form validation

An undefined variable error message, simply tells you that the variable you are trying to use is undefined!


You've done something like this

PHP Code:

if (something_that_might_happen === TRUE)
{
  $message = "Wow it worked"!
}

echo $message; 


So $message ONLY Exists - ie is defined if your IF statement is TRUE... When it's not, $message does not exist!


So you need to ensure that if you are going to use a variable anywhere, that it has to be SET to something!

PHP Code:

$message = '';
if ($something_that_might_happen === TRUE)
{
  $message = "Wow it worked"!
}
echo $message; 


or

PHP Code:

if ($something_that_might_happen === TRUE)
{
  $message = "Wow it worked!";
}
else
{
  $message = "Well that didn't work";
}
echo $message; 


And then you'd ask - Where does $something_that_might_happen get set?

PHP Code:

if (isset($something_that_might_happen) AND $something_that_might_happen === TRUE)
{
  $message = "Wow it worked!";
}
else
{
  $message = "Well that didn't work";
}
echo $message; 


And if you are using $_POST or _GET and any array and using those to test or display. Do they exist?

So really it's a matter of - "Oh I get an undefined variable or index or whatever.. Is it defined when it's being used?"

Hope that helps you fix your issue!