SimpleXML 中不再存在节点
我有一个似乎无法解决的问题。当 $array 为空时，下面的代码将返回 php 错误“节点不再存在”。如果 $array 不为空，则可以正常工作。当 $array 为空时，$prinid = $array[0]; 行将显示错误。
$doc = new SimpleXmlElement($data, LIBXML_NOCDATA);
foreach($doc as $a => $b) {
if ($a == 'principal-list') {
$array = $b->principal->attributes();
}
}
$prinid = $array[0];
if (isset($array[0])) {
$currentuser = 1;
} else {
$currentuser = 0;
}
更新：
这是我现在所拥有的，我得到：
警告：count() [function.count]：节点不再存在于 * * * * * * *
$doc = new SimpleXmlElement($data, LIBXML_NOCDATA);
foreach($doc as $a => $b) {
if ($a == 'principal-list') {
$array = $b->principal->attributes();
}
}
$currentuser = 0;
if (isset($array) && count($array) > 0) {
$prinid = $array[0];
$currentuser = 1;
}
I have a problem that I cannot seem to fix. The code below will return a php error "Node no longer exists" when $array is empty. If $array is not empty it works fine. The error will show up for the line with $prinid = $array[0]; when $array is empty.
$doc = new SimpleXmlElement($data, LIBXML_NOCDATA);
foreach($doc as $a => $b) {
if ($a == 'principal-list') {
$array = $b->principal->attributes();
}
}
$prinid = $array[0];
if (isset($array[0])) {
$currentuser = 1;
} else {
$currentuser = 0;
}
Update:
Here is what I have now and I get:
Warning: count() [function.count]: Node no longer exists in * * * * * * *
$doc = new SimpleXmlElement($data, LIBXML_NOCDATA);
foreach($doc as $a => $b) {
if ($a == 'principal-list') {
$array = $b->principal->attributes();
}
}
$currentuser = 0;
if (isset($array) && count($array) > 0) {
$prinid = $array[0];
$currentuser = 1;
}
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这意味着您尝试获取的属性不存在。您应该检查数组不为空
It means that the attribute you are trying to get isn't there. You should check that array isn't empty
重要的事情 - 检查
$b->principal- 您需要检查此 xml 对象是否为空。如果这是 true，那么在任何尝试解析$b->principal->attributes()时，您都会收到此错误。Important thing - check
$b->principal- you need check this xml object for empty. If it is true then on any try resolve$b->principal->attributes()you can get this error.