$parser = new Parser( $wgParserConf );
$parser->setFunctionTagHook( $tag, [ $this, 'functionTagCallback' ], 0 );
$parserOutput = $parser->parse(
"Foo<$tag>Bar</$tag>Baz",
Title::newFromText( 'Test' ),
$parser = new Parser( $wgParserConf );
$parser->setFunctionTagHook( $tag, [ $this, 'functionTagCallback' ], 0 );
$parserOutput = $parser->parse(
"Foo<$tag>Bar</$tag>Baz",
Title::newFromText( 'Test' ),