用PHP重复XML解析

我以前问过，得到了一个实例的答案，现在我必须将XML文件的多个重复实例解析为PHP变量；XML文件如下所示：

<status>
  <client type="s" name="root" desc="" protocol="server" protocolext="" au="0" thid="0x15e9190">
     <request="0000" srvid="0000" time="" history="" answered=""></request>
     <times login="2013-04-16T10:59:16+0200" online="7001" idle="0"></times>
     <connection ip="127.0.0.1" port="0">OK</connection>
  </client>
  <client type="p" name="user1" desc="" protocol="run1" protocolext="" au="-1" thid="0x15f1790">
     <request="0000" srvid="0000" time="" history="2667" answered=""></request>
     <times login="2013-04-16T10:59:16+0200" online="7001" idle="6999"></times>
     <connection ip="127.0.2.2" port="10002">CONNECTED</connection>
  </client>
  <client type="p" name="user2" desc="" protocol="run2" protocolext="" au="-1" thid="0x15f32b0">
     <request="0000" srvid="0000" time="" history="" answered=""></request>
     <times login="2013-04-16T10:59:16+0200" online="7001" idle="7001"></times>
     <connection ip="127.0.3.1" port="12001">CONNECTED</connection>
  </client>
  <client type="p" name="user3" desc="" protocol="run1" protocolext="" au="-1" thid="0x1631170">
     <request="0000" srvid="0000" time="" history="" answered=""></request>
     <times login="2013-04-16T10:59:16+0200" online="7001" idle="7001"></times>
     <connection ip="127.0.4.1" port="9600">CONNECTED</connection>
  </client>
</status>

和回音变量：

echo $client_type;
echo $name ;
echo $conn_ip;

它只返回第一个值：

从上面的文件中提取所有数据的最佳方法是什么？

获取所有

节点，然后在其上循环是一种使dom遍历更清晰的好方法。下面是一个获取所有客户端信息的示例

$dom = new DOMDocument();
$dom->loadXml($xml);
$xpath = new DOMXpath($dom);

// use the double // to find ALL clients in the document
$clientXpath = "//client";
$clients = $xpath->evaluate($clientXpath);


// foreach client node
foreach ($clients as $ii=>$client) {
  // get the type attribute of client node
  echo $client->getAttribute('type') . "\n";
  // get the name attribute of client node
  echo $client->getAttribute('name') . "\n";

  // get clients children
  $children = $client->childNodes;
  foreach ($children as $child) {
    // ignore textnodes
    if ($child instanceof DomText) {
      continue;
    }

    // now concern ourself only with the connection tag, which
    // contains the ip
    if ($child->tagName == 'connection') {
      print $child->getAttribute('ip') . "\n";
    }
  }  
}

---

在DOMXpath中使用的Xpath表达式，除非结果被强制转换为标量，否则返回一个DOMNodelist。因此，可以将该示例扩展为迭代节点列表。在循环中，节点用作表达式的上下文

$dom = new DOMDocument();
$dom->loadXml($xml);
$xpath = new DOMXpath($dom);

foreach ($xpath->evaluate('/status/client') as $client) {
  var_dump(
    $xpath->evaluate('string(@type)', $client),
    $xpath->evaluate('string(@name)', $client), 
    $xpath->evaluate('string(connection/@ip)', $client)
  );
}

演示：

$dom = new DOMDocument();
$dom->loadXml($xml);
$xpath = new DOMXpath($dom);

foreach ($xpath->evaluate('/status/client') as $client) {
  var_dump(
    $xpath->evaluate('string(@type)', $client),
    $xpath->evaluate('string(@name)', $client), 
    $xpath->evaluate('string(connection/@ip)', $client)
  );
}