Descriptionbool xdiff_file_diff ( string file1, string file2, string dest [, int context [, bool minimal]])
xdiff_file_diff() makes unified diff of files file1 and file2 and stores result in file dest. context indicated how many lines of context you want to include in diff result. Set minimal to TRUE if you want to minimalize size of diff (can take a long time).
如果成功则返回 TRUE，失败则返回 FALSE。
See also xdiff_string_diff().