Description: ------------ This bug is present in Version 0.1.1 of Text_Diff, more exactly in its diff Renderer (and likely also in earlier versions). Wether the xdiff PECL extension is loaded or not - too much trailing context is added to the generated unified diff hunks. A patch to fix this is available from http://www.computer-leipzig.com/~mb/Text_Diff/ Test script: --------------- <?php // run me from the commandline // uncomment the following line to try it with xdiff //dl('xdiff.so'); require_once 'Text/Diff.php'; require_once 'Text/Diff/Renderer.php'; require_once 'Text/Diff/Renderer/unified.php'; // i don't use php5 function my_file_put_contents($filename, $contents) { $h = fopen($filename, 'w'); fwrite($h, $contents); fclose($h); } my_file_put_contents("dt.orig", "\nOriginal Text\n\n\n\nss\nttt\n"); my_file_put_contents("dt.new", "\nModified Text\n\n\n\nss\nttt\n"); $o = explode("\n", file_get_contents("dt.orig")); $n = explode("\n", file_get_contents("dt.new")); $diffobj = new Text_Diff($o, $n); $renderer = new Text_Diff_Renderer_unified( array(leading_context_lines=>3, trailing_context_lines=>3)); echo $renderer->render($diffobj); // baseline :) //system('diff -u dt.orig dt.new'); Expected result: ---------------- @@ -1,5 +1,5 @@ -Original Text +Modified Text Actual result: -------------- @@ -1,7 +1,7 @@ -Original Text +Modified Text ss ttt