Description:
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Using apc.php out of the latest version 4.0.7

Inserted a single value and went to look at the 'User Cache Entries' page, which generated the following errors:

[02-Jan-2015 18:51:05 America/Chicago] PHP Notice:  Undefined index: key in C:\wamp\www\apc.php on line 1045
[02-Jan-2015 18:51:05 America/Chicago] PHP Stack trace:
[02-Jan-2015 18:51:05 America/Chicago] PHP   1. {main}() C:\wamp\www\apc.php:0


There is no array value named 'key' in the $entry array, as seen on the printed array below

Ln  918: $fieldkey='key';
Ln 1044: echo '[<a href="', $MY_SELF, '&OB=', $MYREQUEST['OB'], '&DU=', urlencode($entry[$fieldkey]), '">Delete Now</a>]';

Array
(
    [info] => headers47
    [ttl] => 0
    [num_hits] => 0
    [modification_time] => 1420246095
    [creation_time] => 1420246095
    [deletion_time] => 0
    [access_time] => 1420246095
    [ref_count] => 0
    [mem_size] => 5808
)

I changed Ln 918 to "$fieldkey='info';". The page was then displayed correctly and I was able to delete individual elements.