PHP - What is the automatically generated .XML.cache file in the cache folder?



I have a CMS which is written in object oriented PHP. The system has files, temp, langs, template, cache, ... directories with a MySQL database. When I run the index.php of the system, a file called en.allPages.XML.cache is automatically generated inside the cache folder. Codes in the en.allPages.XML.cache file look like as follows:


s:12:"Home";a:7:{s:3:"es";s:12:"Home";}s:8:"SignUp";a:7:{s:3:"en";s:8:"SignUp";}s:8:"SignIn"; ...


Also, I noticed that the system uses XML_Serializer and Zend PEAR.php packages.


My question is that what is the automatically generated en.allPages.XML.cache file inside the cache folder?


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