(PECL xdiff >= 0.2.0)
xdiff_string_diff — Make unified diff of two strings
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 (with default value of 3). 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. Default is 3.
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.
Example #1 xdiff_string_diff() example
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;
}
?>
Note: This function doesn't work well with binary strings. To make diff of binary strings use xdiff_string_bdiff()/xdiff_string_rabdiff().