How can a PHP developer improve the design of code with multiple nested loops?

Nested loops can make code difficult to read and maintain. To improve the design, consider breaking down the nested loops into separate functions or using array functions like array_map or array_walk to simplify the logic. This can make the code more modular, easier to understand, and reduce the complexity of nested loops. 

// Example of improving code with multiple nested loops using array functions

$data = [1, 2, 3, 4, 5];

// Original nested loops
foreach ($data as $item) {
    foreach ($item as $subItem) {
        // Do something
    }
}

// Improved code using array_map
array_map(function($item) {
    // Do something
}, $data);

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