GeezerVison

public static function onParserFirstCallInit( Parser $parser ) { ... }

{
	"Hooks": {
		"ParserFirstCallInit": "MediaWiki\\Extension\\MyExtension\\Hooks::onParserFirstCallInit"
	}
}

• Parser $parser: Parser object being initialized

For examples on how this hook should be used, please see:

• Manual:Parser functions — using curly braces such as {{#expr: ... }}
• Manual:Tag extensions — using XML-type tags such as ‎<ref>…‎</ref>

• phab:T299528 - Deprecate and remove ParserFirstCallInit hook (move hook/tag registration out of Parser constructor)

• Manual:ParserFirstCallInitHook.php

• MediaWiki hooks
• Hooks added in MediaWiki 1.12.0
• MediaWiki hooks included in Parser.php