Php mysql到mysqli删除

我正在将MySQL转换为mysqli，我完全陷入了删除状态

function RemoveItem($itemid) {
    global $db_user, $db_password, $db_database;
    $link_id = mysqli_connect("$db_host", "$db_user", "$db_password", "$db_database");
    if (mysqli_connect_errno()) {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }
    mysqli_query("delete from cart where cookieid = '" . GetCartId() . "'    and itemid = $itemid");
}

通过

或

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您是否有任何错误mysqli\u query$link\u id，从c中删除………YeeeEssss。。。。？！卡在哪里/如何/为什么/什么/谁/何时？

mysqli_query($connection,"your query");

$connection->query("your Query");