Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /var/www/public/backinclude/config.inc.php:21
Stack trace:
#0 /var/www/public/set_include.php(6): connect_db()
#1 /var/www/public/list_teacher.php(3): include('/var/www/public...')
#2 {main}
thrown in /var/www/public/backinclude/config.inc.php on line 21