DifferenceEngineOldHeaderNoOldRevHook.php
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DifferenceEngineOldHeaderNoOldRevHook.php
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	<?php

	namespace MediaWiki\Diff\Hook;

	/**
	* This is a hook handler interface, see docs/Hooks.md.
	* Use the hook name "DifferenceEngineOldHeaderNoOldRev" to register handlers implementing this interface.
	*
	* @stable to implement
	* @ingroup Hooks
	*/
	interface DifferenceEngineOldHeaderNoOldRevHook {
	/**
	* Use this hook to change the $oldHeader variable in cases when there is no old revision
	*
	* @since 1.35
	*
	* @param string &$oldHeader Empty string by default
	* @return bool\|void True or no return value to continue or false to abort
	*/
	public function onDifferenceEngineOldHeaderNoOldRev( &$oldHeader );
	}