Available from version 1.7.0
Called before diff display
Define function:
public static function onDiffViewHeader( $diff, $oldRev, $newRev ) { ... }
Attach hook:

In extension.json:

	"Hooks": {
		"DiffViewHeader": "MyExtensionHooks::onDiffViewHeader"

For MediaWiki ≤1.25:

$wgHooks['DiffViewHeader'][] = 'MyExtensionHooks::onDiffViewHeader';
Called from:File(s): diff/DifferenceEngine.php

For more information about attaching hooks, see Manual:Hooks.
For examples of extensions using this hook, see Category:DiffViewHeader extensions.


  • $diff - DifferenceEngine object that's calling
  • $oldRev - Revision object of the "old" revision (may be null/invalid)
  • $newRev - Revision object of the "new" revision