<?php
$host="localhost"; // Host name
$username="root"; // Mysql username
$password="admin"; // Mysql password
$db_name="test"; // Database name
$tbl_name="petenci"; // Table name
$imie=$_POST['imie'];
$nazwisko=$_POST['nazwisko'];
$indeks=$_POST['indeks'];

// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect server ");
mysql_select_db("$db_name")or die("cannot select DB");

$sql="INSERT INTO $tbl_name(imie, nazwisko,indeks) VALUES('$imie', '$nazwisko', '$indeks')";
$result=mysql_query($sql);

    //check if query successful
if($result){
    echo "DODANO";
    }

    else {
        echo "ERROR";
    }

mysql_close();
?>