如何解析此XML并搜索特定的键值

Question

我有以下xml内容：

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
   <params>
      <param>
         <value>
            <array>
               <data>
                  <value>
                     <array>
                        <data>
                           <value>
                              <string>Car</string>
                           </value>
                           <value>
                              <string>1</string>
                           </value>
                        </data>
                     </array>
                  </value>
                  <value>
                     <array>
                        <data>
                           <value>
                              <string>Plane</string>
                           </value>
                           <value>
                              <string>2</string>
                           </value>
                        </data>
                     </array>
                  </value>
                  <value>
                     <array>
                        <data>
                           <value>
                              <string>Boat</string>
                           </value>
                           <value>
                              <string>3</string>
                           </value>
                        </data>
                     </array>
                  </value>
               </data>
            </array>
         </value>
      </param>
   </params>
</methodResponse>

我想只知道数据3来取回数字Boat

这是我所做的：

$xml = new SimpleXMLElement($response);
$arr_response = $xml->params->param->value->array->data->value->array->data;
foreach ($arr_response as $key => $value) {
    if($key == "Boat"){
        echo "Found !";
        echo "$key -> $value";
    }else{
        echo "Not found";
    }
}

输出：

Not found

Answer 1

由于您正在处理xml，因此仅使用xpath更为简单：

$xml = simplexml_load_string($response);
$boat = $xml->xpath('//data//value[string="Boat"]/following-sibling::value/string');
echo $boat[0];

输出：

3

Answer 2

您可以按以下方式使用DomDocument

$doc = new DOMDocument();
$doc->loadXML($data);

$xpath = new DOMXPath($doc);

foreach ($xpath->query("//data[./value[1]/string[contains(text(), 'Boat')]]") as $boat) {
    echo $boat->getElementsByTagName("string")[1]->textContent;
}