Warning: session_start(): Session cannot be started after headers have already been sent in C:\xampp\htdocs\header.php on line 2

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\towar.php:1) in C:\xampp\htdocs\header.php on line 3

Fatal error: Uncaught Error: Call to undefined function sqlsrv_connect() in C:\xampp\htdocs\connection.php:10 Stack trace: #0 C:\xampp\htdocs\towar.php(10): require() #1 {main} thrown in C:\xampp\htdocs\connection.php on line 10