PHP mysqli_ping() Function

<?php/* j a v a 2  s. co  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();
}

if (mysqli_ping($con)){
  echo "Connection is ok!";
}else{
  echo "Error: ". mysqli_error($con);
}

mysqli_close($con);
?>

<?php/*from  jav  a  2  s  .  co m*/
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

if ($mysqli->connect_errno) {
    printf("Connect failed: %s\n", $mysqli->connect_error);
    exit();
}

/* check if server is alive */
if ($mysqli->ping()) {
    printf ("Our connection is ok!\n");
} else {
    printf ("Error: %s\n", $mysqli->error);
}

$mysqli->close();
?>