Fatal error: Uncaught TypeError: implode(): Argument #1 ($array) must be of type array, string given in /var/www/html/public_html/cerficitaion-plan.php:486 Stack trace: #0 /var/www/html/public_html/cerficitaion-plan.php(486): implode() #1 {main} thrown in /var/www/html/public_html/cerficitaion-plan.php on line 486