How do I get rollup count 'Total' in table - php

Question

I have created a table in the database which displays Date, User, Value. The following is a revised design:
Date | User | Value
---------- | ----- | -----
So each user has a count of what submissions they have done matching via the date. The results are displayed from this query from the database
SELECT * FROM testreport
Please see the new design below as mentioned from the comments, I have added the row total at the end.
Date | User1 | User2 | User3 | Value
---------- | ----- | ----- | ----- | -----------
23-02-2017 | 2 | 5 | 9 | 16
24-02-2017 | 5 | 7 | 11 | 23
25-02-2017 | 6 | 13 | 1 | 20
But what I am trying to achieve is by selecting the table and have total to show in the last row like this, how do I go about doing this:
Date | User1 | User2 | User3 | Value
---------- | ----- | ----- | ----- | -----------
23-02-2017 | 2 | 5 | 9 | 16
24-02-2017 | 5 | 7 | 11 | 23
25-02-2017 | 6 | 13 | 1 | 20
Total | 13 | 25 | 21 | 59
but I cannot specify the column names like How do I calc a total row using a PIVOT table, without UNION, ROLLUP or CUBE?. Because from time time there will be extra users added to this table but I want to be able to get all the columns with totals at the end. On my site I am using PHP to display the table on the page with the code:
$sqlres = "SELECT * FROM testreport order by Date DESC ";
$resultsql = mysqli_query($sqlres) or die(mysql_error());
echo "<table><tr>";
for($i = 0; $i < mysqli_num_fields($resultsql); $i++) {
$field_info = mysqli_fetch_field($resultsql, $i);
echo "<th>{$field_info->name}</th>";
}
// Print the data
while($rows = mysqli_fetch_row($resultsql)) {
echo "<tr>";
foreach($rows as $_column) {
echo "<td>{$_column}</td>";
}
echo "</tr>";
}
echo "</table>";
Which displays the headers and rows as I wanted them to be and any new user I add to the 'testreport' table column it automatically adds an extra column on the page, how do I go about achieving the rollup of these columns to get total.
Any help on this would be appreciated.