Manual:ImportDump.php

Details
importDump.php file is a maint-scripts>Special:MyLanguage/Manual:Maintenance scripts|maintenance script to import XML dump files into the current wiki. It reads pages from an XML file as produced from Special:Export or , and saves them into the current wiki.

In case you get an error "failed to open stream: No such file or directory", make sure that the specified file does exist and that PHP has access to it.

Examples
or