PHP iterator to recursively iterate through a folder.

iterate.php

<?php 

$folderPath = __DIR__ . '/path/to/folder/';

try {
    $dirIterator = new \RecursiveDirectoryIterator($folderPath);
    /** @var \RecursiveDirectoryIterator | \RecursiveIteratorIterator $it */
    $it = new \RecursiveIteratorIterator($dirIterator);

    // the valid() method checks if current position is valid eg there is a valid file or directory at the current position
    while ($it->valid()) {
        // isDot to make sure it is not current or parent directory
        if (! $it->isDot() && $it->isFile() && $it->isReadable()) {
          
          // $file is a SplFileInfo instance
          $file = $it->current();
          $filePath = $it->key();
          // do something about the file
          // ...
          require $filePath;
        }

        $it->next();
    }
} catch (\Exception $e) {
    throw $e;
}