What potential pitfalls should beginners be aware of when working with arrays in PHP, especially when trying to sort and display specific data like in the provided code snippet?

Beginners should be aware of potential pitfalls such as not properly initializing arrays, accessing elements that do not exist, and using incorrect sorting functions. When working with arrays in PHP, it is important to ensure that the array is properly populated with data before trying to access or manipulate it. Additionally, using the correct sorting function based on the data type is crucial to avoid unexpected results.

// Example code snippet demonstrating proper array initialization and sorting

// Initialize an array with sample data
$numbers = [5, 2, 8, 1, 9];

// Sort the array in ascending order
sort($numbers);

// Display the sorted array
foreach ($numbers as $number) {
    echo $number . " ";
}