$pattern - a string containing the pattern to search the directory for.
$dirpath - a string containing the directory path to search.
$pattern_type - a string containing the type of pattern matching functions to use (can either be 'php', 'perl' or 'shell').
The format of the $pattern depends on the $pattern_type-value. For more information see search methods
$fullpath - whether the string should be matched against the full path or only against the filename
$match - can be either 'files', 'directories' or 'both' to specify the kind of list to return