SpecialCategories.php

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<?php
class SpecialCategories extends SpecialPage {

    public function __construct() {
        parent::__construct( 'Categories' );

        // Since we don't control the constructor parameters, we can't inject services that way.
        // Instead, we initialize services in the execute() method, and allow them to be overridden
        // using the initServices() method.
    }

    public function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
        $this->getOutput()->allowClickjacking();

        $from = $this->getRequest()->getText( 'from', $par );

        $cap = new CategoryPager(
            $this->getContext(),
            $from,
            $this->getLinkRenderer()
        );
        $cap->doQuery();

        $this->getOutput()->addHTML(
            Html::openElement( 'div', [ 'class' => 'mw-spcontent' ] ) .
                $this->msg( 'categoriespagetext', $cap->getNumRows() )->parseAsBlock() .
                $cap->getStartForm( $from ) .
                $cap->getNavigationBar() .
                '<ul>' . $cap->getBody() . '</ul>' .
                $cap->getNavigationBar() .
                Html::closeElement( 'div' )
        );
    }

    protected function getGroupName() {
        return 'pages';
    }
}