在使用 Dom Document 时如何检查对象是否存在,因为我正在获取
error "Trying to get property of non-object"
$getplacename = '//table//tr';
$getplacename2 = $xpath->query($getplacename);
//loop through each individual card
foreach($getplacename2 as $getplacename22) {
echo $getplacename22 ->childNodes->item(0)->childNodes->item(2)->textContent;
echo $getplacename22 ->childNodes->item(4)->textContent;
echo "<br /><br /><br />";
}
最佳答案
嗯,我认为执行此类操作的最简单方法是将代码更改为类似的内容(假设错误发生在以下行之一中):
foreach($getplacename2 as $getplacename22) {
if ($getplacename22->childNodes->item(0) != null && $getplacename22->childNodes->item(0)->childNodes->item(2) != null) {
echo $getplacename22->childNodes->item(0)->childNodes->item(2)->textContent;
}
if($getplacename22 ->childNodes->item(4) != null) {
echo $getplacename22->childNodes->item(4)->textContent;
}
echo "<br /><br /><br />";
}
关于javascript - 尝试获取非对象的属性 -> 如何检查对象是否存在,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31609780/