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().
Starting with version 1.5.0 this function is an alias of xdiff_string_bdiff().
old_dataFirst string with binary data. It acts as "old" data.
new_dataSecond string with binary data. It acts as "new" data.
Returns string with result or false if an internal error happened.