Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/skill/public_html/db/db.php:15
Stack trace:
#0 /home/skill/public_html/db/db.php(15): mysqli_query(NULL, 'SELECT * FROM `...')
#1 /home/skill/public_html/db/db.php(65): db->query('SELECT * FROM `...')
#2 /home/skill/public_html/demo.php(6): db->select('tbl_pages', '*', '`id` = '16'')
#3 {main}
thrown in /home/skill/public_html/db/db.php on line 15
