Warning: Undefined variable $yourArray in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\LibreriaACD\PHP\Arrays.php on line 4

Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\LibreriaACD\PHP\Arrays.php:4 Stack trace: #0 {main} thrown in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\LibreriaACD\PHP\Arrays.php on line 4