PHP Compare Directories: Compare files in two directories and find changes

This class has been very useful for me in two instances, the first is
to determine filed that have been modified by comparing a sites files
to distribution files and the second is to locate infections on a site
by comparing the site files to a saved copy of a site. I save copies
of all sites i work on.

To use:
	initialize the class:
	    include ('compare.class.php');		// Load the class
	    $cmp = new compare();				// Initialize the class
	set up the source and update(pristine) directories:    
	    $cmp->set_source($dir.'\Source');	// Directory where Source files are
	    $cmp->set_update($dir.'\Update');	// Directory where pristeen files are
	do the compare:
	    $cmp->do_compare();					// Do the compare
	and get the reults:
	    $removed = $cmp->get_removed();		// Get the results
	    $added = $cmp->get_added();			// ...
	    $changed = $cmp->get_changed();		// ...
	    
It is up to you to format the results.