Manual:Hooks/DiffViewHeader

DiffViewHeader
Available from version 1.7.0 Called before diff display
Define function:	public static function onDiffViewHeader( $diff, $oldRev, $newRev, &$out ) { ... }
Attach hook:	$wgHooks['DiffViewHeader'][] = 'MyExtensionHooks::onDiffViewHeader';
Called from:	DifferenceEngine.php

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

Details

$diff - DifferenceEngine object that's calling
$oldRev - Revision object of the "old" revision (may be null/invalid)
$newRev - Revision object of the "new" revision
$out - OutputPage object, since 1.21 (gerrit change 53603)