PHP mysqli_get_proto_info() Function

<?php/*from  j ava2s  .  c o  m*/
$con=mysqli_connect("localhost","my_user","my_password","my_db");

if (mysqli_connect_errno($con)){
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

echo mysqli_get_proto_info($con);

mysqli_close($con);
?>

<?php//from j a  v  a2 s .  c om
$mysqli = new mysqli("localhost", "my_user", "my_password");

if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

print $mysqli->protocol_version;

$mysqli->close();
?>