Fatal error: Uncaught Error: Call to undefined function mysql_query() in /home/f9zi0skcnwx3/public_html/school/include/header.php:23 Stack trace: #0 /home/f9zi0skcnwx3/public_html/school/index.php(15): include() #1 {main} thrown in /home/f9zi0skcnwx3/public_html/school/include/header.php on line 23