public function setPHPTrace(string $php_trace = "F") : CNabuDataObject
    {
        if ($php_trace === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$php_trace")
            );
        }
        $this->setValue('nb_site_target_php_trace', $php_trace);
        
        return $this;
    }