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Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in D:\Web\llwj\productindex.php on line 17

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, bool given in D:\Web\llwj\productindex.php:20 Stack trace: #0 D:\Web\llwj\productindex.php(20): mysqli_query(false, 'SET CHARACTER S...') #1 {main} thrown in D:\Web\llwj\productindex.php on line 20