diff --git a/include/DifferenceEngine/DifferenceEngine.php b/include/DifferenceEngine/DifferenceEngine.php
index 126e74be9..2fb1fa08c 100644
--- a/include/DifferenceEngine/DifferenceEngine.php
+++ b/include/DifferenceEngine/DifferenceEngine.php
@@ -42,7 +42,7 @@ class _DiffOp {
 class _DiffOp_Copy extends _DiffOp {
 	var $type = 'copy';
 
-	function _DiffOp_Copy ($orig, $closing = false) {
+	function __construct($orig, $closing = false) {
 		if (!is_array($closing))
 		$closing = $orig;
 		$this->orig = $orig;
@@ -62,7 +62,7 @@ class _DiffOp_Copy extends _DiffOp {
 class _DiffOp_Delete extends _DiffOp {
 	var $type = 'delete';
 
-	function _DiffOp_Delete ($lines) {
+	function __construct($lines) {
 		$this->orig = $lines;
 		$this->closing = false;
 	}
@@ -80,7 +80,7 @@ class _DiffOp_Delete extends _DiffOp {
 class _DiffOp_Add extends _DiffOp {
 	var $type = 'add';
 
-	function _DiffOp_Add ($lines) {
+	function __construct($lines) {
 		$this->closing = $lines;
 		$this->orig = false;
 	}
@@ -98,7 +98,7 @@ class _DiffOp_Add extends _DiffOp {
 class _DiffOp_Change extends _DiffOp {
 	var $type = 'change';
 
-	function _DiffOp_Change ($orig, $closing) {
+	function __construct($orig, $closing) {
 		$this->orig = $orig;
 		$this->closing = $closing;
 	}
@@ -569,7 +569,7 @@ class Diff
 	 *		  (Typically these are lines from a file.)
 	 * @param $to_lines array An array of strings.
 	 */
-	function Diff($from_lines, $to_lines) {
+	function __construct($from_lines, $to_lines) {
 		$eng = new _DiffEngine;
 		$this->edits = $eng->diff($from_lines, $to_lines);
 		//$this->_check($from_lines, $to_lines);
@@ -721,7 +721,7 @@ class MappedDiff extends Diff
 	 * @param $mapped_to_lines array This array should
 	 *	have the same number of elements as $to_lines.
 	 */
-	function MappedDiff($from_lines, $to_lines,
+	function __construct($from_lines, $to_lines,
 	$mapped_from_lines, $mapped_to_lines) {
 		//wfProfileIn( __METHOD__ );
 
@@ -993,7 +993,7 @@ define('NBSP', ' '); // iso-8859-x non-breaking space.
  * @ingroup DifferenceEngine
  */
 class _HWLDF_WordAccumulator {
-	function _HWLDF_WordAccumulator () {
+	function __construct () {
 		$this->_lines = array();
 		$this->_line = '';
 		$this->_group = '';
@@ -1056,7 +1056,7 @@ class _HWLDF_WordAccumulator {
 class WordLevelDiff extends MappedDiff {
 	const MAX_LINE_LENGTH = 10000;
 
-	function WordLevelDiff ($orig_lines, $closing_lines) {
+	function __construct ($orig_lines, $closing_lines) {
 		//wfProfileIn( __METHOD__ );
 
 		list ($orig_words, $orig_stripped) = $this->_split($orig_lines);
@@ -1137,7 +1137,7 @@ class WordLevelDiff extends MappedDiff {
  * @ingroup DifferenceEngine
  */
 class TableDiffFormatter extends DiffFormatter {
-	function TableDiffFormatter() {
+	function __construct() {
 		$this->leading_context_lines = 2;
 		$this->trailing_context_lines = 2;
 	}