string xdiff_string_diff    ( string $old_data   , string $new_data   [, int $context = 3   [, bool $minimal = FALSE  ]] )

xdiff_string_diff — Make unified diff of two strings

old_data

First string with data. It acts as "old" data.

new_data

Second string with data. It acts as "new" data.

context

Indicates how many lines of context you want to include in the diff result.

minimal

Set this parameter to TRUE if you want to minimalize the size of the result (can take a long time).