Makes an unified diff containing differences between old_data
string and new_data
string and returns it. The resulting diff is human-readable. An optional context
parameter specifies how many lines of context should be added around each change. Setting minimal
parameter to true will result in outputting the shortest patch file possible (can take a long time).
First string with data. It acts as "old" data.
Second string with data. It acts as "new" data.
Indicates how many lines of context you want to include in the diff result.
Set this parameter to TRUE
if you want to minimalize the size of the result (can take a long time).
Returns string with resulting diff or FALSE
if an internal error happened.
This function doesn't work well with binary strings. To make diff of binary strings use xdiff_string_bdiff()/xdiff_string_rabdiff().
The following code makes unified diff of two articles.
<?php $old_article = file_get_contents('./old_article.txt'); $new_article = $_REQUEST['article']; /* Let's say that someone pasted a new article to html form */ $diff = xdiff_string_diff($old_article, $new_article, 1); if (is_string($diff)) { echo "Differences between two articles:\n"; echo $diff; } ?>
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