How can I ensure that a recursive function in PHP efficiently processes a directory with multiple subfolders and files?

To ensure that a recursive function efficiently processes a directory with multiple subfolders and files in PHP, you can optimize the function by using directory iterators instead of recursive function calls. Directory iterators provide a more efficient way to iterate over directories and their contents without the overhead of multiple function calls.

function processDirectory($directory){
    $iterator = new RecursiveDirectoryIterator($directory);
    foreach(new RecursiveIteratorIterator($iterator) as $file){
        // Process each file here
    }
}

// Usage
$directory = "/path/to/directory";
processDirectory($directory);