roundcubemail/plugins/userinfo/userinfo.php

<?php

/**
 * Sample plugin that adds a new tab to the settings section
 * to display some information about the current user
 */
class userinfo extends rcube_plugin
{
    public $task = 'settings';
    public $noajax = true;
    public $noframe = true;

    #[Override]
    public function init()
    {
        $this->add_texts('localization/', ['userinfo']);
        $this->add_hook('settings_actions', [$this, 'settings_actions']);
        $this->register_action('plugin.userinfo', [$this, 'infostep']);
    }

    public function settings_actions($args)
    {
        $args['actions'][] = [
            'action' => 'plugin.userinfo',
            'class' => 'userinfo',
            'label' => 'userinfo',
            'domain' => 'userinfo',
        ];

        return $args;
    }

    public function infostep()
    {
        $this->register_handler('plugin.body', [$this, 'infohtml']);

        $rcmail = rcmail::get_instance();
        $rcmail->output->set_pagetitle($this->gettext('userinfo'));
        $rcmail->output->send('plugin');
    }

    public function infohtml()
    {
        $rcmail = rcmail::get_instance();
        $user = $rcmail->user;
        $identity = $user->get_identity();

        $table = new html_table(['cols' => 2, 'class' => 'propform']);

        $table->add('title', html::label('', rcube::Q($this->gettext('userid'))));
        $table->add('', rcube::Q($user->ID));

        $table->add('title', html::label('', rcube::Q($this->gettext('username'))));
        $table->add('', rcube::Q($user->data['username']));

        $table->add('title', html::label('', rcube::Q($this->gettext('server'))));
        $table->add('', rcube::Q($user->data['mail_host']));

        $table->add('title', html::label('', rcube::Q($this->gettext('created'))));
        $table->add('', rcube::Q($user->data['created']));

        $table->add('title', html::label('', rcube::Q($this->gettext('lastlogin'))));
        $table->add('', rcube::Q($user->data['last_login']));

        $table->add('title', html::label('', rcube::Q($this->gettext('defaultidentity'))));
        $table->add('', rcube::Q($identity['name'] . ' <' . $identity['email'] . '>'));

        $legend = rcube::Q($this->gettext(['name' => 'infoforuser', 'vars' => ['user' => $user->get_username()]]));
        $out = html::tag('fieldset', '', html::tag('legend', '', $legend) . $table->show());

        return html::div(['class' => 'box formcontent'],
            html::div(['class' => 'boxtitle'], $this->gettext('userinfo'))
            . html::div(['class' => 'boxcontent'], $out)
        );
    }
}