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the loop on line 16 in "my-sql-export (backup) database.php" is not necessary since it already loops through the columns on line 19.
for ($i = 0, $st_counter = 0; $i < $fields_amount; $i++, $st_counter=0)

It wont cause any issues, since the next statement goes to the next row, so after you've gone through the first column in this loop, all the rows would have been visited.

if I want to export all DB contents like table procedures views functions triggers this tool does not support, so if you can give me some tips or updating this tool is much appreciated.
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Is it possible to export only the data without the table structure?

Please share how to backup to a specified directory on the Server.

In my-sql-import (restore) database.php, null values exported from the database are imported as empty strings. Is there a fix for this?

Many thanks for the scripts.