Makes a diff of two files and stores the result in a file.
file1
file2
destPath of the resulting file.
contextIndicates how many lines of context you want to include in diff result.
minimalSet this parameter to TRUE if you want to minimalize size of diff (can take a long time). Resulting file is human-readable.
Note: This function doesn't work well with binary files. To make diff of binary files use xdiff_file_diff_binary().