$(document).ready(funtion(){
    <?php
        $servername = "";
        $username = "";
        $password = "";

        $connection = new mysqli($servername, $username, $password);
        if ($connection->connect_error)
            die("Connection failed: ".$connection->connect_error);
        $sql = "SELECT nazwa from artysci";
        $result = $connection->query($sql);

        echo(
            "<script>".
            "var wykonawcy = JSON.parse(".print_r($result).");"
            "".
            "</script>";
            );
    ?>
});