Notice: Undefined index: feet

marengbj

Hey, hows it going?

I'm making my first form without the $GET["feet"] function after reading this article.

Instead I am using:

$feet = filter_input(INPUT_GET, "feet", FILTER_SANITIZE_NUMBER_FLOAT,FILTER_FLAG_ALLOW_FRACTION);

In the past, isset got rid of the undefined index notice:

if (!isset( $_GET["feet"] )
       $_GET["feet"] = "dummyvalue"

Is there an equivalent when using filter_input()?

Thanks!

anakadote

How about:

if(isset($_GET["feet"])){
   $feet = filter_input(INPUT_GET, "feet", FILTER_SANITIZE_NUMBER_FLOAT,FILTER_FLAG_ALLOW_FRACTION); 
}

marengbj

cheers anakadote, your solution does work, but I cant for the life of me figure out why!?

I did some further experimentation and found that even this works!

echo isset($_GET["feet"]);

$feet = filter_input(INPUT_GET, "feet", FILTER_SANITIZE_NUMBER_FLOAT,FILTER_FLAG_ALLOW_FRACTION);

Is $_GET["feet"] assigned some not NULL value as part of the isset() function?

Also, what does it actually mean to define an index?

Thanks!

anakadote

isset() checks to see if a variable has a non-null value. So in my example filter() is only called if the $GET["feet"] variable ($GET index) has a non-null value. Undefined index essentially means that a value has not been set for a variable. Note this is just a notice and not fatal error. You could turn off these warnings by adjusting your error reporting settings (although you could avoid the notice to begin with by using my example).