In what situations would it be appropriate to seek help from the PHP community for coding challenges, and how can one do so effectively while respecting community guidelines?

Issue: I am trying to sort an array of numbers in descending order using PHP but I am encountering errors in my code. Code snippet:

```php
// Array of numbers
$numbers = [5, 2, 8, 1, 9];

// Sorting array in descending order
rsort($numbers);

// Output sorted array
print_r($numbers);
```

By using the `rsort()` function in PHP, you can easily sort an array of numbers in descending order. This function will rearrange the elements in the array from highest to lowest.