Fatal error: Uncaught Error: Class 'mysqli' not found in /home/bernair/public_html/linkoor.ir/php/Panel.php:52 Stack trace: #0 /home/bernair/public_html/linkoor.ir/php/Panel.php(26): Panel->connectDatabase() #1 /home/bernair/public_html/linkoor.ir/header.php(3): Panel->__construct() #2 /home/bernair/public_html/linkoor.ir/index.php(2): require_once('/home/bernair/p...') #3 {main} thrown in /home/bernair/public_html/linkoor.ir/php/Panel.php on line 52