Helper/FormHelper.php
protected function _parseValue($item, $content)
    {
        $value = null;
        try {
            $value = PropertyAccess::createPropertyAccessor()->getValue($item, $content);
        } catch (UnexpectedTypeException $e) {
            // Suppress potentially null values
        }

        return $value;
    }
protected function _parseValue($item, $content)
    {
        $value = null;
        try {
            $value = PropertyAccess::createPropertyAccessor()->getValue($item, $content);
        } catch (UnexpectedTypeException $e) {
            // Suppress potentially null values
        }

        return $value;
    }
Parse Value

Given a starting object, this will split $content into parts and
iterate through each part, effectively creating a chained method
call.

@param object $item
@param string $content
@return mixed