streams/Code/Widget/Random_block.php

<?php

namespace Code\Widget;

use App;

class Random_block implements WidgetInterface
{

    public function widget(array $arguments): string
    {

        $channel_id = 0;
        if (array_key_exists('channel_id', $arguments) && intval($arguments['channel_id'])) {
            $channel_id = intval($arguments['channel_id']);
        }
        if (!$channel_id) {
            $channel_id = App::$profile_uid;
        }
        if (!$channel_id) {
            return '';
        }

        if (array_key_exists('contains', $arguments)) {
            $contains = $arguments['contains'];
        }

        $o = '';

        require_once('include/security.php');
        $sql_options = item_permissions_sql($channel_id);

        $randfunc = db_getfunc('RAND');

        $r = q(
            "select item.* from item left join iconfig on item.id = iconfig.iid
			where item.uid = %d and iconfig.cat = 'system' and iconfig.v like '%s' and iconfig.k = 'BUILDBLOCK' and
			item_type = %d $sql_options order by $randfunc limit 1",
            intval($channel_id),
            dbesc('%' . $contains . '%'),
            intval(ITEM_TYPE_BLOCK)
        );

        if ($r) {
            $o = '<div class="widget bblock">';
            if ($r[0]['title']) {
                $o .= '<h3>' . $r[0]['title'] . '</h3>';
            }

            $o .= prepare_text($r[0]['body'], $r[0]['mimetype']);
            $o .= '</div>';
        }

        return $o;
    }
}