$database =  "****";
$hostname = "***.***.***.***";
$port = 50000;
$user = "***";
$password = "***";

$dsn = "DATABASE=$database;HOSTNAME=$hostname;PORT=$port;
  PROTOCOL=TCPIP;UID=$authID;PWD=$auth_pass;";
$options = array ("trustedcontext" => DB2_TRUSTED_CONTEXT_ENABLE);

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

if ($conn) {
    echo "Connection succeeded.\n";
    if (db2_autocommit($conn)) {
         echo "Autocommit is on.\n";
    }
    else {
         echo "Autocommit is off.\n";
    }
    db2_close($conn);
}
else {
    echo "Connection failed.";
}
?>

$dsn = "DRIVER=php_ibm_db2;DATABASE=$database;HOSTNAME=$hostname;PORT=$port;PROTOCOL=TCPIP;UID=$user;PWD=$password;";

$options = array ("trustedcontext" => DB2_TRUSTED_CONTEXT_ENABLE);

$conn = db2_connect($dsn, $user, $password, $options);

if ($conn) {
    echo "Connection succeeded.\n";
    if (db2_autocommit($conn)) {
         echo "Autocommit is on.\n";
    }
    else {
         echo "Autocommit is off.\n";
    }
    db2_close($conn);
}
else {
   echo '<p>1. Ошибка соединения c СУБД DB2: '.db2_conn_errormsg().". conn string=$conn_string</p>";

}