AddTitleHandler.php

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<?php

namespace Elgg\Page;

class AddTitleHandler {
    
    public function __invoke(\Elgg\Event $event) {
        $head_params = $event->getValue();
    
        $title = $event->getParam('title');
        if (empty($title)) {
            $head_params['title'] = elgg_get_site_entity()->getDisplayName();
        } else {
            $head_params['title'] = $title . ' : ' . elgg_get_site_entity()->getDisplayName();
        }
    
        return $head_params;
    }
}