Warning: Undefined array key "fields" in /var/www/html/json/index.php on line 18

Fatal error: Uncaught TypeError: sizeof(): Argument #1 ($value) must be of type Countable|array, null given in /var/www/html/json/index.php:18 Stack trace: #0 {main} thrown in /var/www/html/json/index.php on line 18