This method adds files and directories to an existing archive. If the archive does not exist, it attempts to create it. The files and directories listed are added at the end of the archive, even if a file with the same name is already archived.
Parameter
mixed $filelist - an array of filenames and directory names, or a single string with names separated by a single blank space. For each directory added in the archive, the files and sub-directories are also added.
Return value
boolean - Returns TRUE on success, FALSE on failure.
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