Available from version 1.6.0
Runs for every Special page that extends the QueryPage class (fired when including the file QueryPage.php). It is only useful in maintenance/updateSpecialPages.php and in QueryPage Api.
Define function:
public static function onwgQueryPages( &$wgQueryPages ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"wgQueryPages": "MyExtensionHooks::onwgQueryPages"
Called from: File(s): specialpage/QueryPage.php
Interface: WgQueryPagesHook.php

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