xdiff_string_bdiff - Make binary diff of two strings
Makes a binary diff of two strings and returns the result. This function works with both text and binary data. Resulting patch can be later applied using xdiff_string_bpatch() / xdiff_file_bpatch().
PHP PECL xdiff >= 0.2.0
Returns string with binary diff containing differences between "old" and "new" data or FALSE if an internal error occurred.