PHP 7.1.18 Released


(PECL xdiff >= 0.2.0)

xdiff_string_diffMake unified diff of two strings


string xdiff_string_diff ( string $old_data , string $new_data [, int $context = 3 [, bool $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).

Elenco dei parametri


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).

Valori restituiti

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.

$new_article $_REQUEST['article']; /* Let's say that someone pasted a new article to html form */

$diff xdiff_string_diff($old_article$new_article1);
if (
is_string($diff)) {
"Differences between two articles:\n";




This function doesn't work well with binary strings. To make diff of binary strings use xdiff_string_bdiff()/xdiff_string_rabdiff().

Vedere anche:

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