Fatal error: Uncaught Error: Undefined constant "category_arr" in /var/www/html/lin_blog/include/main.php:1088 Stack trace: #0 /var/www/html/lin_blog/include/main.php(234): res_view() #1 /var/www/html/lin_blog/index.php(39): foo() #2 {main} thrown in /var/www/html/lin_blog/include/main.php on line 1088