ImageFilterIterator extends FilterIterator and uses FilesystemIterator itself

gistfile1.php

<?php

class ImageFilterIterator extends FilterIterator {

	// overwriting the constructor to automagically create an inner iterator
	// to surf the file system when given a path name.

	public function __construct($path) {
		parent::__construct(new FilesystemIterator($path));
		return;
	}

	// overwriting the accept method to perform a super simple test to
	// determine if the files found were images (types we want at least) or
	// not.

	public function accept() {
		if(preg_match('/^(?:gif|jpe?g|png)$/i',$this->getExtension())) {
			return true;
		} else {
			return false;
		}
	}

}