Where do the numbers at the end of the filename come from?

Question

PHP

Shared folder in google drive.
On the first device, the file is overwritten (replaced). Let it be file.txt
As a result, the file disappears on the second device (windows 7), and file(1).txt appears instead.
I would understand if the file was not deleted, then this can not be replaced on the first device. But the original file is gone. This is not the first time, and the picture is the same every time.

Answer 1

Write in head <meta charset="utf8">

Answer 2

As said above.
Database connection

$mysqli = new mysqli($hostname, $username, $password, $first_base);
//Настройки соединения
$mysqli->query("set character_set_client='utf8'");
$mysqli->query("set character_set_results='utf8'");
$mysqli->query("set collation_connection='utf8_general_ci'");

It seems to me, or do you have a base in cp1251 encoding, and the Users table in utf8?
Choose one encoding and do everything in it.

Answer 3

here what?