(PECL xdiff >= 1.5.0)
xdiff_string_bdiff — Make binary diff of two strings
xdiff_string_bdiff ( string $old_data , string $new_data ) : string
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().
old_data
First string with binary data. It acts as "old" data.
new_data
Second string with binary data. It acts as "new" data.
Returns string with binary diff containing differences between "old" and "new" data or false
if an internal error occurred.
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https://www.php.net/manual/en/function.xdiff-string-bdiff.php