(PECL xdiff >= 0.2.0)
xdiff_string_diff — Make unified diff of two strings
$old_data,$new_data,$context = 3,$minimal = false
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).
old_dataFirst string with data. It acts as "old" data.
new_dataSecond string with data. It acts as "new" data.
contextIndicates 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).
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().