( 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).
Resulting file is human-readable.
This function doesn't work well with binary files. To make diff of binary
files use xdiff_file_diff_binary().
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
See also xdiff_string_diff().