What is a common issue when listing array elements with commas in PHP?

When listing array elements with commas in PHP, a common issue is that the last element will also have a trailing comma, which can cause syntax errors or unexpected behavior in your code. To solve this issue, you can use the `implode()` function to join the array elements with commas, excluding the last element.

$fruits = ["apple", "banana", "orange", "kiwi"];
echo implode(", ", array_slice($fruits, 0, -1)) . " and " . end($fruits);