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PHP Integrating PHP with Databases Using Relational Tables Understanding SQL Injections

fngr
fngr
11,179 Points
Posted by fngr
fngr
11,179 Points

After filter_input the $id is NULL

Hi everbody!

When trying to get the single_item_array function to work, I stumpled over a problem: the $_GET["id"] value is set as a string with value (i.e.) "2". But when I filter the input I get back a NULL so my query doesnt work und throws an error. my filter_input looks like this:

$id = filter_input(INPUT_GET, $_GET["id"], FILTER_SANITIZE_NUMBER_INT);

some ideas why? what am I doing wrong?

Best regards Matthias

2 Answers

jlampstack
jlampstack
23,932 Points
jlampstack
jlampstack
23,932 Points

"I'm a student too, but from my understanding you are using $_GET["id"] when you only need "id"

Alena shows the code as this....

$id = filter_input(INPUT_GET, "id", FILTER_SANITIZE_NUMBER_INT);
fngr
fngr
11,179 Points
fngr
fngr
11,179 Points

Ok I got it to work with filter_var instead of filter_input. So my code now looks like:

  if (isset($_GET["id"])) {
    $getId = $_GET["id"];
    $id = filter_var($getId, FILTER_SANITIZE_NUMBER_INT);
    $item = single_item_array($id);
  }

But I don't know why it doesnt work with filter_input...