Fatal error: Uncaught Error: Call to undefined function DAL\mysqli_connect() in /var/www/html/admin/DAL/Db.php:65 Stack trace: #0 /var/www/html/admin/DAL/Db.php(103): DAL\Db->openConnection() #1 /var/www/html/admin/MAPPER/CategoriaMapper.php(44): DAL\Db->querySelect('SELECT * FROM c...') #2 /var/www/html/admin/BLL/CategoriaBll.php(38): MAPPER\CategoriaMapper->listarConProductos() #3 /var/www/html/menu.php(8): BLL\CategoriaBll::listarConProductos() #4 {main} thrown in /var/www/html/admin/DAL/Db.php on line 65