Attempts to change the owner of the file filename to user user (specified by name or number). Only the superuser may change the owner of a file.
Returns TRUE on success or FALSE on failure.
Note: This function will not work on remote files as the file to be examined must be accessible via the servers filesystem.
Note: When safe mode is enabled, PHP checks whether the files or directories you are about to operate on have the same UID (owner) as the script that is being executed.
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