switch country_flag

//--------------------------------------
//  ID            country
//--------------------------------------
//   1            Italy, USA, Germany
//   2            Italy, USA
//   3            Italy
//   4            Italy, United Kingdom
//--------------------------------------



$sql = "SELECT country  FROM film where film_id = '3'";
$result = $conn->query($sql);
while ($row = $result->fetch_array()) {

    $str = $row['country'];
    $group1 = array("Italy"=>"it.png","Russia"=>"ru.png","USA"=>"us.png",
        "France"=>"fr.png","United Kingdom"=>"uk.png","Sweden"=>"se.png",
        "Denmark"=>"dk.png","Germany"=>"de.png",
        "Japan"=>"jp.png","Poland"=>"pl.png");

    $count_words = str_word_count($str);
    switch ($count_words){
        case 1:
            list($uno) = explode(',', $str);
            foreach ($group1 as $string){
                if (strpos($uno, $string)!==false){
                }
                $primo = $uno . ' <img src="img/separate/'.$string.'">';
             }
                echo $primo;
            break;
        case 2:
            list($uno, $due) = explode(',', $str);
            foreach ($group1 as $string) {
                if (strpos($uno, $string)!==false){
                }
             elseif (strpos($due, $string)!==false){
                }
                $primo = $uno . ' <img src="img/separate/'.$string.'">';
                $secondo = $due . ' <img src="img/separate/'.$string.'">';
            }
                echo $primo . ', ' . $secondo;
            break;
        case 3:
            list($uno, $due, $tre) = explode(',', $str);
            foreach ($group1 as $string) {
                if (strpos($uno, $string)!==false){
                }
                elseif (strpos($due, $string)!==false){
                }
                elseif (strpos($tre, $string)!==false){
                }
            $primo = $uno . ' <img src="img/separate/'.$string.'">';
            $secondo = $due . ' <img src="img/separate/'.$string.'">';
            $terzo = $tre . ' <img src="img/separate/'.$string.'">';
            }
            echo $primo.', '.$secondo.', '.$terzo;
            break;
        default:
            echo 'no match';
    }