Available from version 1.9.0
Called just before the upload form is generated.
Define function:
public static function onUploadForm_initial( SpecialUpload $uploadFormObj ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"UploadForm:initial": "MediaWiki\\Extension\\MyExtension\\Hooks::onUploadForminitial"
Called from: File(s): specials/SpecialUpload.php
Interface: UploadForm_initialHook.php

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

Details edit

  • $uploadFormObj: current SpecialUpload object