Untitled

<!DOCTYPE html>
<html>
<head>
    <title>asd</title>
    <?php
    $servername = "localhost";
    $username = "root";
    $password = "jp2gmd";
    $dbname = "muzyka";

    $connection = new mysqli($servername, $username, $password, $dbname);
    if ($connection->connect_error)
        die("Connection failed: ".$connection->connect_error);

    $sql[0] = "SELECT nazwa from artysci";
    $result = $connection->query($sql[0]);
    echo(
     "<script>".
     "var wykonawcy = [");
    foreach ($result as $key => $value) {
      echo("\"".$value["nazwa"]."\",");
  }
  echo("];".
     "</script>"
     );

  $ilosc = "SELECT count(nazwa) FROM artysci";
  for($i=0; $i<$ilosc; $i++){
    $sql[$i] = "SELECT tytul from albumy where id_artysty='$i+1'";
    $result[$i] = $connection->query($sql[$i]);
    echo(
        "<script>".
        "var albumy[$i] = [");
    foreach ($result[$i] as $key => $value) {
        echo("\"".$value["tytul"]."\",");
    }
    echo("];".
        "</script>"
        );
}

        ?>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
        <script type="text/javascript">
            $(document).ready(function(){
                var $el = $("#selectId");
            $el.empty();
            for (var i=0; i<wykonawcy.length; i++)
                $el.append($("<option></option>").attr("value", i).text(wykonawcy[i]));
        });
            function selected(albumy, value){
                alert(albumy[value]);
            }
        </script>
    </head>
    <body>
        <form>
            <select id="selectId" onchange="selected(this.value)">
                <option>asd</option>
            </select>
        </form>
    </body>
    </html>