织梦更新列表页提示Fatal error: Call to a member function GetInnerText

$innerTmp = $arcTag->GetInnerText();

$innerTmp = ($arcTag=="") ? trim($arcTag) : trim($arcTag->GetInnerText());

if($arcTag==""){
    $innerTmp = trim($arcTag);
}
else{
    $innerTmp = trim($arcTag->GetInnerText());
}