bro look line xinc config
exemple :
has the line:
define('ODBC_USER', 'sa'); // Default user for all.
define('ODBC_PASS', 'YOURPASSWORD'); // the password you have chosen to install sql server
$odbc_connect = odbc_connect('DRIVER={SQL Server};SERVER=DESKTOP-V3Q8QOF\SQLEXPRESS', ODBC_USER, ODBC_PASS); ------------- > YOUR PROBLEM

you have "SERVER=" before DESKTOP-XX\SQLEXPRESS? Maybe you deleted it by mistake?
You’ve got the wrong setup
SERVER=YOURNAME\SQLEXPRESS