<?php
$mysqli = new mysqli("172.16.21.83", "root2", "cobolt@112358", "proto_type");

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

$city = "bim2016001";

/* create a prepared statement */
if ($stmt = $mysqli->prepare("Select name from student where id = ?")) {
    /* bind parameters for markers */
    $stmt->bind_param("s", $city);
    /* execute query */
    $stmt->execute();
    /* bind result variables */
    $stmt->bind_result($district);
    /* fetch value */
    $stmt->fetch();
    printf("%s is in district %s\n", $city, $district);
    /* close statement */
    $stmt->close();
}

/* close connection */
$mysqli->close();
?>