在同一个数组上使用filter_input_array和array_filter

Question

I have a variable set of identical input fields in my form where some can be empty.

<input type="text" class="form-control" name="option[]" placeholder="fill in" />
<input type="text" class="form-control" name="option[]" placeholder="optional" />
<input type="text" class="form-control" name="option[]" placeholder="optional" />

the values of these input fields come into the array $_POST["option"]

I want to filter $_POST["option"] and for that I am using the following code:

$filter = array("option" => array("filter"=>FILTER_CALLBACK,"flags"=>FILTER_FORCE_ARRAY,"options"=>"ucwords"));
$optionfin = filter_input_array(INPUT_POST, $filter);

But now I want to also use the array_filter function to remove the empty fields so I can INPUT only the filled in fields into my database but this doesn't seem to work.

$option = array_filter($optionfin);

when I do the following:

$optionfin = array_filter($_POST["option"]);

this is working fine, but i know you better not access the $_POST this way because it isn't that safe...

Can anyone help me to point out where i am going wrong?

Thanks

Answer 1

Because you are using filter_input_array, you will actually end up with an associative array that corresponds to $_POST. So to filter out empty fields as you are trying to do, you will need to specify the option key:

$option = array_filter($optionfin['option']);