如何在PHP函数中使用Mysql数组的行

我在PHP中有一个函数，我想从我的MYSQL数据库中导出一个数组，然后使用循环中的行来处理它们。

    $DB_Server = "XXX.XXX.XXX.XXX";
    $DB_Username = "XXXX";
    $DB_Password = "XXXXX";
    $DB_Database = "XXXXX";

    $conn = new mysqli($DB_Server, $DB_Username, $DB_Password, $DB_Database);
    $query = "Select Name, Wert from test.DBPBX";
function show(array $options) {
    global $showresult, $master, $conn, $query;
    $result = mysqli_query($conn, $query);
        while ($row = mysqli_fetch_assoc($result)) {
        $cnlongname =  $row["Name"];
        $usercontent = $row["Wert"];
        $cn = $cnlongname;
        $options['config']->value = 1;
        $config = $options["config"]->value;
        $show = new SimpleXMLElement("<show/>");
        $user = $show->addChild("user");
        $user->addAttribute("cn", $cn);
        if ($config)
            $user->addAttribute("config", "true");
        print "cmd: " . htmlspecialchars($show->asXML()) . "'n";
        $showresult = $master->Admin($show->asXML());
        print "result: " . htmlspecialchars($showresult) . "'n";
        $mod = "text=".$usercontent;
        $modify = new SimpleXMLElement("$showresult");
        $user = $modify->user;
        $path = explode("/device/hw/", $mod);
        $srch = $user;
        $nsegments = count($path);
        $i = 1;
        foreach ($path as $p) {
            if ($i == $nsegments) {
                // last part, the modification
                list($attr, $value) = explode("=", $p);
                $srch[$attr] = $value;
            } else {
                $srch = $srch->$p;
            }
            $i++;
        }
        $modify = new SimpleXMLElement("<modify>" . $user->asXML() . "</modify>");
        print "cmd: " . htmlspecialchars($cmd = $modify->asXML()) . "'n";
        // do it
        $result = $master->Admin($cmd);
        print "result: " . htmlspecialchars($result);
        }
    }

对于$cn，我想使用$cnlongname（或$row["Name"]）。对于$mod，我想使用$usercontent（或$row["Wert"]）。然而，当我想使用它时，我在第一个循环后出现了一个错误：

警告：mysqli_fetch_assoc（）要求参数1为mysqli_result，上/sample.php中给定的字符串175线

第175行为：

while ($row = mysqli_fetch_assoc($result)) {

你能帮帮我吗？