What are the potential pitfalls of using arrays for calculations in PHP?

Using arrays for calculations in PHP can lead to potential pitfalls such as slower performance due to the overhead of managing array elements, increased memory usage, and potential errors when working with large datasets. To avoid these issues, consider using more efficient data structures such as variables or built-in PHP functions for calculations.

// Example of using variables for calculations instead of arrays
$number1 = 10;
$number2 = 20;

$result = $number1 + $number2;

echo $result;