Modx Revolution symlinks across sub-domain contexts

$docResource = $modx->newObject('modContextResource');  
	  
// now, lets save some data into the fields  
$docResource->set('context_key','sst');  // replace sst with your context key for your new context 
$docResource->set('resource', '13'); // replace 13 with your resource ID
	  
// okay, now we're ready. let's save.  
if ($docResource->save() === false) {  
  die('An error occurred while saving!');  
}

<?php

if (!function_exists('add_resource_to_context')) 
{
   function add_resource_to_context($docResource, $context_key , $resource_id )
        {				
		// now, lets save some data into the fields  
		$docResource->set('context_key',$context_key);  
		$docResource->set('resource', $resource_id);
			  
		// okay, now we're ready. let's save.  
		if ($docResource->save() === false) {  
			return 'Resource '.$resource_id.' was <b>NOT</b> successfully added to the '.$context_key.' context.<br />';
		} else {
			return 'Resource '.$resource_id.' was successfully added to the '.$context_key.' context.<br />';
		}
	}
}


$containerArray = array (13,62,88,90);
$contextArray = array('sst');

$resources = $modx->getCollection('modResource');  
foreach ($resources as $resource) 
{  

	foreach ($containerArray as $parentId) 
	{
		if ($resource->get('parent') == $parentId || $resource->get('id') == $parentId)
		{
			foreach ($contextArray as $context) 
			{
				echo add_resource_to_context($modx->newObject('modContextResource'), $context, $resource->get('id'));
			}
		}
	}

}