Warning: Undefined array key "s" in /usr/local/apache2/htdocs/common/count.php on line 3

Fatal error: Uncaught TypeError: join(): Argument #2 ($array) must be of type ?array, string given in /usr/local/apache2/htdocs/common/count.php:76 Stack trace: #0 /usr/local/apache2/htdocs/common/count.php(76): join() #1 {main} thrown in /usr/local/apache2/htdocs/common/count.php on line 76