Simple File filtering in PHP

RecurDirIteration

class IncExtFilterIterator extends FilterIterator
{
    
    protected $_extensions;

    public function __construct($path, $includeExt)
    {
        parent::__construct(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path)));

        $this->_extensions = $includeExt;
    }

    public function accept()
    {
        $item = $this->getInnerIterator();
        $filename = $item->getFileName();
        if ($item->isFile() && in_array(pathinfo($filename, PATHINFO_EXTENSION), $this->_extensions)) {
            return true;
        }
    }

}