Question

I have a form field called $_POST['hidden-tags']

It has values entered in as follows

cars, vans, bikes, trains,

I on post im trying to split the values and save them into an array and then compare that array with another I have and only display the values that are different. I know the $arr1 has values as I have tested the data.

the code I have so far is

  $arr1;

  $arr2 = array();

foreach($_POST['hidden-tags'] as $value){
$arr2[] = explode(",",$value);  
}

print_r($arr2);

   // $tmp = array_diff_key($arr1, $arr2);
     //  echo $tmp;

parts of which I found here on stack
PHP explode array

As you can see I have the final bit commented out. This is so I can see the array values. If I echo the $arr2 all I see on screen is

Array()

even though I have entered cars, bikes, vans. I have not got as far as comparing the two array yet and displaying the $tmp variable

Answer 1

Is $_POST['hidden-tags'] a text input field? If so, you don’t need to run a foreach on it to split it into an array. Just explode it and compare the generated array with the one you already have.