使用SimpleXML PHP解析XML（自关闭）

我需要从XML字符串中解析一些字段。我的PHP代码如下所示：

$oscam2 = simplexml_load_string($xml2);
//$oscam2 = simplexml_load_string($xml2, 'SimpleXMLElement', LIBXML_NOEMPTYTAG);
$oscaa = $oscam2->status->client[2][request]['caid'];
echo $oscaa;
die(var_dump($oscaa));

<oscam version="1.20-unstable_svn build r10649"revision="10649" starttime="2015-05-27T06:41:07-0400"uptime="954150" readonly="0">
<status>
<client type="s" name="root" desc="" protocol="server"protocolext="" au="0" thid="id_0x1d3d260">

<request caid="0000" srvid="0000" ecmtime=""ecmhistory="" answered=""/>

<times login="2015-05-27T06:41:07-0400" online="954150"idle="740499"/>

<connection ip="127.0.0.1" port="0">OK</connection>

</client>

<client type="h" name="root" desc="" protocol="http"protocolext="" au="0" thid="id_0x7f8e8c0008c0">

<request caid="0000" srvid="0000" ecmtime=""ecmhistory="" answered=""/>

<times login="2015-05-27T06:41:07-0400" online="954150"idle="0"/>

<connection ip="127.0.0.1" port="0">OK</connection>

</client>

<client type="p" name="Sky" desc="" protocol="cccam_ext (2.2.1-3316)" protocolext="OSCam v1.20-unstable_svn, build r10666 (x86_64-linux-gnu-ssl) [EXT,SID,SLP]"au="-1" thid="id_0x7f8e74006340">

<request caid="0000" srvid="0000" ecmtime=""ecmhistory="" answered=""/>

<times login="2015-06-05T15:53:12-0400" online="143425"idle="143383"/>

<connection ip="XXX"port="34010">OFF</connection>

</client>

</status>

<log>

<![CDATA[
logdata

]]>

<![CDATA[
logdata

]]>

</log>

</oscam>

我的XML文件如下所示：

$oscam2 = simplexml_load_string($xml2);
//$oscam2 = simplexml_load_string($xml2, 'SimpleXMLElement', LIBXML_NOEMPTYTAG);
$oscaa = $oscam2->status->client[2][request]['caid'];
echo $oscaa;
die(var_dump($oscaa));

<oscam version="1.20-unstable_svn build r10649"revision="10649" starttime="2015-05-27T06:41:07-0400"uptime="954150" readonly="0">
<status>
<client type="s" name="root" desc="" protocol="server"protocolext="" au="0" thid="id_0x1d3d260">

<request caid="0000" srvid="0000" ecmtime=""ecmhistory="" answered=""/>

<times login="2015-05-27T06:41:07-0400" online="954150"idle="740499"/>

<connection ip="127.0.0.1" port="0">OK</connection>

</client>

<client type="h" name="root" desc="" protocol="http"protocolext="" au="0" thid="id_0x7f8e8c0008c0">

<request caid="0000" srvid="0000" ecmtime=""ecmhistory="" answered=""/>

<times login="2015-05-27T06:41:07-0400" online="954150"idle="0"/>

<connection ip="127.0.0.1" port="0">OK</connection>

</client>

<client type="p" name="Sky" desc="" protocol="cccam_ext (2.2.1-3316)" protocolext="OSCam v1.20-unstable_svn, build r10666 (x86_64-linux-gnu-ssl) [EXT,SID,SLP]"au="-1" thid="id_0x7f8e74006340">

<request caid="0000" srvid="0000" ecmtime=""ecmhistory="" answered=""/>

<times login="2015-06-05T15:53:12-0400" online="143425"idle="143383"/>

<connection ip="XXX"port="34010">OFF</connection>

</client>

</status>

<log>

<![CDATA[
logdata

]]>

<![CDATA[
logdata

]]>

</log>

</oscam>

好啊
好啊
关

---

如您所见，我想解析元素“Sky”的[request]['caid']字段的内容（“0000”）。你知道怎么做吗？请求和时间的XML是自关闭的。

我认为您需要执行以下操作来获取元素属性

$oscam2->status->client[2]->request->attributes()['caid'];

如果这对您不起作用，那么您使用的是较旧的PHP版本，需要执行类似的操作

$attributes = $oscam2->status->client[2]->request->attributes();
$value = $attributes['caid'];

---

首先，检查simpleXML是否可以读取字符串，因为属性之间没有空格。当解析xml时没有错误时，可以使用xpath来避免更改

客户机

项的顺序。它将

客户端

节点与

名称

相等

'Sky'

然后在

请求

节点的属性

caid

中：

$oscam2 = simplexml_load_string($xml2);
if(!$oscam2) die("Error reading xml string");
$caid = (string)$oscam2->xpath('//client[@name="Sky"]/request/@caid')[0];
echo $caid; // 0000

表示您的XML无效。