public/plugin/show_regions/index.php
<?php
// Only show the region information if the admin is logged in.
if (api_is_platform_admin()) {
echo '<div style="color:black;height:50px;width:200px;background-color:#FFE378">';
//We can have access to the current block and the block information with the variable $plugin_info (see your plugin.php)
echo $plugin_info['current_region'];
echo '</div>';
}