What is the processor to create resource from front-end?

<?php

    private function _tvId ($tvName) {
        $tmplvars = array();
        $c = $this->modx->newQuery('modTemplateVar');
        $c->select('DISTINCT `modTemplateVar`.*');
        $c->where(array(
            'modTemplateVar.name' => $tvName,
        ));
        $tvObject = $this->modx->getObject('modTemplateVar',$c);
        $tvId = $tvObject->id;
        return $tvId;
    }

<?php
default:
    /* handles checkboxes & multiple selects elements */
    if (is_array($value)) {
        $featureInsert = array();
        while (list($featureValue, $featureItem) = each($value)) {
            $featureInsert[count($featureInsert)] = $featureItem;
        }
        $value = implode('||',$featureInsert);
    }
    break;