Makes a binary diff of two files and stores the result in a file. This function works with both text and binary files.
The following code makes binary diff of two archives.
$old_version = 'my_script_1.0.tgz';
$new_version = 'my_script_1.1.tgz';
xdiff_file_diff_binary($old_version, $new_version, 'my_script.bdiff');
Both files will be loaded into memory so ensure that your memory_limit is set high enough.