Юрий Эффа

<?php
$output = '';
$tvs = array();
$excludeTVs = array(2,15,16); // исключаем картинки и документы

$comparisonIDs = explode(',', $_GET['cmp_ids']);
foreach($comparisonIDs as $child) {
    $tv_query = $modx->newQuery('modTemplateVarResource');
    $tv_query->leftJoin('modTemplateVar','modTemplateVar',array("modTemplateVar.id = tmplvarid"));
    $tv_query->where(array('contentid'=>$child));
    $tv_query->select($modx->getSelectColumns('modTemplateVarResource','modTemplateVarResource','',array('id','tmplvarid','contentid','value')));
    $tv_query->select($modx->getSelectColumns('modTemplateVar','modTemplateVar','',array('name')));
    $tvars = $modx->getCollection('modTemplateVarResource',$tv_query);
    foreach ($tvars as $tvar) {
        $tvar = $tvar->toArray();
        if( !in_array($tvar['tmplvarid'], $excludeTVs) ) { $tvs[] = $tvar['tmplvarid']; }
    }
}
$tvs = array_unique($tvs);
$i = 0;
    foreach( $tvs as $tv ) {
        if( $i != 0 ) { $output .= ","; }
        $tvObj = $modx->getObject('modTemplateVar', $tv );
        $fields = $tvObj->toArray();
        if (preg_match('/^@/',$fields['elements'])) { $fields['elements'] = $tvObj->processBindings($fields['elements']); }
        $output .= '"'.$fields['name'].'"';
        $i++;
    }
//echo '<pre>'.print_r($tvs, true).'</pre>';
return $output;