我希望你能找到一个用户表的记录总数

$link=mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_NAME);
$result = mysqli_query($link,'SELECT SUM(your_column_name) AS value_sum FROM  User_Table'); 
//or like the query for return last row that indicate total number of record 
// id auto increment
$result = mysqli_query($link,'SELECT * FROM User_Table ORDER BY id DESC LIMIT 1;'); 
$row = mysqli_fetch_assoc($result); 
$sum = $row['id'];
echo $sum;  

// or using count
    $result = mysqli_query($link,'SELECT COUNT(*) total_row FROM User_Table;'); 
    $row = mysqli_fetch_assoc($result); 
    $sum = $row['total_row '];
    echo $sum;

据我所知，您需要计算数据库的列数。如果我没有错，你可以使用下面的查询

select * from information_schema.columns
where table_schema = '<YOUR DATABASE NAME>'
order by table_name,ordinal_position

希望这有帮助。谢谢