PHP commonly used conn notation?? Very, very weak question.

The first day of contact with PHP, see the W3 tutorial. The problem is very weak, few points, don't take offense.

There may be multiple libraries under MySQL (Library 01, library 02, library 03)
When writing conn.php, should it be written as follows?

And then, in all the files,

Reply to discussion (solution)

Yes

The database name is best in English, so it is more stable.

Well, that's it.

conn.php
$conn =mysql_connect ("Address of MySQL database", "username", "password");

search,php
Include ' conn.php ';
mysql_select_db ("The Library", $conn);
...
Mysql_close ($conn);
Include ' conn.php ';
mysql_select_db ("library", $conn);
...
Mysql_close ($conn);
Include ' conn.php ';
mysql_select_db ("library", $conn);
...
Mysql_close ($conn);
?>

