private function _getWarningByType($sType)
{
if (!isset($this->_aRequirements[$sType]['version'])) {
return '';
}
if ($this->_checkPHPVersion($this->_aRequirements[$sType]['version'])) {
return '';
}
return sprintf($this->_aRequirements[$sType]['error'], $this->_aRequirements[$sType]['version']);
}