Getting the TV variable names and values in a snippet?

$tvs = array('tvone','tvtwo','tvthree... etc);

foreach($tvs as $tv){

    $resource= $modx->getObject('modResource', 123);

    $tvValue = $resource->getTVValue($tv);

    if($tvValue){

         // do something

    }

}

<?php
$output = '';
$resource= $modx->getObject('modResource', 123);
$tvs = $resource->getMany('TemplateVars')


if (!empty($tvs)) {
   foreach($tvs as $tv) {
      $name = $tv->get('name');
      $value = $tv->renderOutput(123);
      $output .= '<br /><br />Name: ' . $name . <br /> . 'Value: ' . $value;
   }
} else {
    $output = 'No TVs found');
}

return $output;

$value = $tv->getValue(123);

/*
*  getBranch
*  return one one level of one branch by single id 
*/
function getBranch($id){
	
	$children = $this->modx->getChildIds($id, 1);
	
	$children[] = $id;
	
	$branch = array();
	
	foreach($children as $id){
	
		$resource = $this->modx->getObject('modResource',$id);
		
		$templateVars = array();

		$content = array();
			
		if($resource){
			
			$content = array(
				'id' => $resource->get('id'),
				'type' => $resource->get('type'),
				'contentType' => $resource->get('contentType'),
				'pagetitle' => $resource->get('pagetitle'),
				'longtitle' => $resource->get('longtitle'),
				'description' => $resource->get('description'),
				'alias' => $resource->get('alias'),
				'llink_attributes' => $resource->get('llink_attributes'),
				'published' => $resource->get('published'),
				'pub_date' => $resource->get('pub_date'),
				'unpub_date' => $resource->get('unpub_date'),
				'parent' => $resource->get('parent'),
				'isfolder' => $resource->get('isfolder'),
				'introtext' => $resource->get('introtext'),
				'content' => $resource->get('content'),
				'richtext' => $resource->get('richtext'),
				'template' => $resource->get('template'),
				'menuindex' => $resource->get('menuindex'),
				'searchable' => $resource->get('searchable'),
				'cacheable' => $resource->get('cacheable'),
				'createdby' => $resource->get('createdby'),
				'createdon' => $resource->get('createdon'),
				'editedby' => $resource->get('editedby'),
				'editedon' => $resource->get('editedon'),
				'deleted' => $resource->get('deleted'),
				'deletedon' => $resource->get('deletedon'),
				'deletedby' => $resource->get('deletedby'),
				'publishedon' => $resource->get('publishedon'),
				'publishedby' => $resource->get('publishedby'),
				'menutitle' => $resource->get('menutitle'),
				'donthit' => $resource->get('donthit'),
				'privateweb' => $resource->get('privateweb'),
				'privatemgr' => $resource->get('privatemgr'),
				'content_dispo' => $resource->get('content_dispo'),
				'hidemenu' => $resource->get('hidemenu'),
				'class_key' => $resource->get('class_key'),
				'context_key' => $resource->get('context_key'),
				'content_type' => $resource->get('content_type'),
				'uri' => $resource->get('uri'),
				'uri_override' => $resource->get('uri_override'),
				'hide_children_in_tree' => $resource->get('hide_children_in_tree'),
				'show_in_tree' => $resource->get('show_in_tree'),
				'properties' => $resource->get('properties')
				);	
				
				$tvs = $resource->getMany('TemplateVars');
		 
				if (!empty($tvs)) {
					
					foreach($tvs as $tv) {
						
						$name = $tv->get('name');
						$value = $tv->getValue($id);
						// if we need the value rendered:
						// $value = $tv->renderOutput($id);
						$templateVars[] = array($name => $value);
						
				}
				
			}
				
		}
				
		$content['template_variables'] = $templateVars;	
		
		$branch[$id] = $content;
	
	}
	
	return $branch;

}

/*
	*  getBranch
	*  return one one level of one branch by single id 
	*/
	function getBranch($id){
		
		$children = $this->modx->getChildIds($id, 1);
		
		$children[] = $id;
		
		$branch = array();
		
		foreach($children as $id){
		
			$resource = $this->modx->getObject('modResource',$id);
			
			$templateVars = array();
	
			$content = array();
				
			if($resource){
				
				$fields = $this->modx->getFields('modResource');
			
				foreach($fields as $key => $value){
					
					$content[$key] = $resource->get($key);
					
				}
					
					$tvs = $resource->getMany('TemplateVars');
			 
					if (!empty($tvs)) {
						
						foreach($tvs as $tv) {
							
							$name = $tv->get('name');
							$value = $tv->getValue($id);
							// if we need the value rendered:
							// $value = $tv->renderOutput($id);
							$templateVars[] = array($name => $value);
							
					}
					
				}
					
			}
					
			$content['template_variables'] = $templateVars;	
			
			$branch[$id] = $content;
		
		}
		
		return $branch;
	
	}

$fields = $this->modx->getFields('modResource');
             
foreach($fields as $key => $value){
 
    $content[$key] = $resource->get($key);
                   
}

$fields  = $resource->toArray();

$content = $resource->toArray();