Description:
------------
I would love to see an alternate function in the API and button in the APC control panel that clears only expired scripts (those with newer timestamps on disk than in the cache) instead of only using the "clear all" feature.

Essentially this is a "stat once" ability.

This feature exists in eaccelerator and is very useful for those that run with the STAT feature turned off, on active servers with a great deal of scripts.

This way only the one or two scripts that were replaced are cleared out and the rest are left in place for best performance.

I've enclosed code that does this via PHP and the API but the problem is without direct support from native code, open_basedir (and/or safemode) will cause this to fail in many environments because it cannot examine the scripts on disk outside the control panel path and will throw an access error.

This is a similar request that was denied in 2007 under bug #57783 "selectively clear cache" - I am hoping it's a good time to re-examine this need as servers are larger and support more active connections than ever before.

I am specifically asking for native support so files can be examined outside of open_basedir restrictions.

Test script:
---------------
$data = apc_cache_info(); 
if (empty($data['cache_list'])) { die('no cached files?');}
$expired=array();
foreach ($data['cache_list'] as $file) {
	if (!empty($file['mtime']) && !empty($file['filename']) 
		&& (!file_exists($file['filename']) || (int)$file['mtime']<filemtime($file['filename']))) {
			$expired[]=$file['filename'];
	}
}
if (!empty($expired)) {apc_delete_file($expired);} 
echo count($expired),' removed from cache';