What potential pitfalls should be considered when using nested loops in PHP for data manipulation?

One potential pitfall when using nested loops in PHP for data manipulation is the risk of decreased performance due to the increased complexity of the code. To avoid this, it is important to optimize the loops and consider alternative approaches such as using array functions or restructuring the data. Additionally, be cautious of potential infinite loops or unintended side effects that may arise from nested loops.

// Example of optimizing nested loops by using array functions
$data = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

foreach ($data as $row) {
    $sum = array_sum($row);
    echo "Sum of row: $sum\n";
}