<?php
$database = '****';
$user = '*****';
$password = '******';
$hostname = '********';
$port = 50000;

$conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;" .
  "HOSTNAME=$hostname;PORT=$port;PROTOCOL=TCPIP;UID=$user;PWD=$password;";
$conn = db2_connect($conn_string, '', '');

if ($conn) {
    echo "Connection succeeded.";
    db2_close($conn);
}
else {
    echo "Connection failed.";
}
?>
$database = 'VARUN';
$user = 'db2i1own';
$password = 'ChangeM3DayCN!';

$conn = db2_connect($database, $user, $password);

if ($conn) {
echo "Connection succeeded.";
    db2_close($conn);
}
else {
    echo "Connection failed.";
}
?>

Call to undefined function db2_connect() in /home/s1.php on line 10