Bug Description

As highlighted by one user in the support forums, there is a conflict between the Performance Lab generated object-cache.php file and the same file generated by third party plugins.

The expected behavior with an additional object-cache.php file generated by another plugin (if the PL plugin is installed first):

1. The PL plugin renames the third party plugins object-cache.php to object-cache-plst-orig.php
2. The PL plugin then loads it's own file, while also loading the object-cache-plst-orig.php file

Steps to reproduce

1. Install the PL plugin
2. Check that that object-cache.php file exists within the sites wp-content directory
3. Install and active W3 Total Cache
4. Within the W3 Total cache settings enable Object Caching (Performance > General > Object Cache > Object Cache > Enable)
5. After enabling object caching within the W3 Total Cache settings a notice will appear recognising the conflict. You can then choose to allow W3 Total Cache to remove the PL inserted object-cache.php file. If doing so, the PL file is removed.

The same issue can be found if using LiteSpeed Cache and applying Object Caching (ListeSpeed Cache > Cache > Object > Object Cache > ON). For this plugin there is no conflict highlighted, instead the PL file is removed (recording of experience)