What are the best practices for managing memory usage in PHP when working with large arrays?

When working with large arrays in PHP, it's important to manage memory usage efficiently to prevent performance issues. One way to do this is by using generators instead of arrays when possible, as generators can reduce memory consumption by yielding values one at a time rather than storing them all at once. Additionally, you can unset variables or elements of the array that are no longer needed to free up memory.

// Example of using a generator to iterate over a large array without loading all data into memory at once
function largeArrayGenerator($largeArray) {
    foreach ($largeArray as $item) {
        yield $item;
    }
}

$largeArray = range(1, 1000000); // Creating a large array with 1 million elements

foreach (largeArrayGenerator($largeArray) as $item) {
    // Process each item without loading the entire array into memory
}