Warning: Undefined variable $sql in /home/ppeinventory/public_html/ppe/scripts/insertStaff.php on line 49

Fatal error: Uncaught TypeError: implode(): Argument #1 ($array) must be of type array, string given in /home/ppeinventory/public_html/ppe/scripts/insertStaff.php:49 Stack trace: #0 /home/ppeinventory/public_html/ppe/scripts/insertStaff.php(49): implode(',', NULL) #1 {main} thrown in /home/ppeinventory/public_html/ppe/scripts/insertStaff.php on line 49