Undefined variable

Anon

When I try to run the following code, I always get a warning: Undefined variable.

I know why it's doing it, but does anybody know how I can make it quit?

<?php

if ("SUBMIT" == $submit){
//Do whatever
}
?>

<form action="<?php echo($PHP_SELF); ?>" method="post">
//Form fields here
<INPUT TYPE=SUBMIT NAME="submit" VALUE="SUBMIT">
</form>

Anon

if (isset($submit) && $submit == "SUMBIT") {
//Do whatever
}

You need to check to see if the variable exists, before you validate what is inside it.

ace21

In your php.ini file there is a line that sets the type of warning and or error messages that it will display.

The default setting is to display all errors and warnings. I can't remember what you change ti to exactly but you can change it so that it only displays actual errors and not warnings. This will bet rid of all undefined variable warnings that are displayed to the screen.

Ace21

Anon

Thank you very much, it worked.

Joey

Anon

I changed the code to no longer give an error, but I believe I will also edit my php.ini file as you have suggested. Thanks for the tip.

Joey

Anon

I don't recommend that you do this. If you change the error reporting and then do something minor like mistyping the name of a varaible it could take you hours to find the error wasting your time when a warning message would have directed it to you in a second.

i.e.

$temp = 1;

if ($test == 1) {
//do something
}

Ofcourse this is easy to see here, but in a large script it may take a long time to find. If you've never used the variable $test then PHP will warn you.

If you have code sections that will display warnings but otherwise don't affect your code turn down the error reporting level in the script error_reporting(); not in the .ini. Always give yourself the most verbose error reporting during development. You can always turn it down or even off when push your code into production.