What are the potential pitfalls of using array functions like array_sum and array_filter in PHP, and how can they be avoided?

One potential pitfall of using array functions like array_sum and array_filter in PHP is that they may not handle edge cases or unexpected input data correctly, leading to errors or unexpected results. To avoid this, always validate the input data before using array functions and handle any edge cases appropriately.

// Example of validating input data before using array functions
$data = [1, 2, 3, '4', 5]; // Input data with a string element
$filteredData = array_filter($data, 'is_numeric'); // Filter out non-numeric elements
$sum = array_sum($filteredData); // Calculate the sum of the filtered data
echo $sum; // Output: 11