isAnon snippet for MODx. Returns the value 1 if the user is anonymous (not logged into the manager)

isAnon.snippet.php

<?php
/**
 * isAnon snippet
 * returns the value 1 if the user is anonymous (not logged into the manager)
 * 
 * example usage: [[!isAnon:is=`1`:then=``:else=`i'm not logged in`]]
 *
 * @author Jon Leverrier ([email protected])
 * @version 1.0
 * @since 10th December 2017
 */
if ($modx->user->hasSessionContext('mgr') ) {
  
    return true;
  
} else {
    return;
}