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The Filesystem API abstracts out the functionality needed for reading and writing local files to the filesystem to be done securely, on a variety of host types.

5 votes

why there is a large file named core in wpmu's directory?

Files named "core" are created when some OS process crashes. In your case it was likely a crash of the php interpreter. These files being memory dumps are used to debug the process "postmortem" - e.g …
Alexander Shcheblikin's user avatar