CacheLite - strange behaviour - possible bug?

[gmb2007]

hello,

we are using pear-lite (1.7.2) caching in a big online shop on php 4.4.3 with several cache groups.
Under certain circumstances it appears, that cache lite returns false instead of the cache entry even if it is not outdated. In our opinion this often appears, while flushing a cache group. But the cache entry is in a different cache group. Has any of you discovered similar behaviour?

While searching for a reason, I discovered the following code in Lite.php, _cleanDir method, line 593 et sqq.

[...]
case 'notingrou':
// START
if (!strpos($file2, $motif, 0)) {
// END
$result = ($result and ($this->_unlink($file2)));
}
break;

case 'callback_':
$func = substr($mode, 9, strlen($mode) - 9);
if ($func($file2, $group)) {
$result = ($result and ($this->_unlink($file2)));
}
break;

case 'ingroup':
default:
// START
if (strpos($file2, $motif, 0)) {
// END
$result = ($result and ($this->_unlink($file2)));
}
break;
[...]

Perhaps there is a problem with implicit type conversion and strpos function.
cf.: http://de.php.net/manual/de/function.strpos.php
Any conclusions?

Thanks in advance!


regards
Bjoern