php - xpath-搜索大于的数字并显示 parent

我试图使设施的enddate高于20170199并且它是父级的，我试图让父级为：：*的父级显示整个树，而不是筛选视图。
给定xml

<Delivery>
   <Person>
     <Name>John</Name>
     <LastName>Doe</LastName>
     <Facility>
       <TypeFacility>2</TypeFacility>
       <StartDate>20161131</StartDate>
       <EndDate>20161231</EndDate>
     </Facility>
     <Facility>
       <TypeFacility>2</TypeFacility>
       <StartDate>20161131</StartDate>
       <EndDate>20170231</EndDate>
     </Facility>
   </Person>
</Delivery>

到目前为止我试过的

<?php
$xmlStr = simplexml_load_file("test.xml");
$res = $xmlStr->xpath("Person/Facility[EndDate>20170199]/parent::*");
echo '<pre>';print_r($res);

预期结果

   <Person>
     <Name>John</Name>
     <LastName>Doe</LastName>
     <Facility>
       <TypeFacility>2</TypeFacility>
       <StartDate>20161131</StartDate>
       <EndDate>20170231</EndDate>
     </Facility>
   </Person>

实际结果

   <Person>
     <Name>John</Name>
     <LastName>Doe</LastName>
     <Facility>
       <TypeFacility>2</TypeFacility>
       <StartDate>20161131</StartDate>
       <EndDate>20161231</EndDate>
     </Facility>
     <Facility>
       <TypeFacility>2</TypeFacility>
       <StartDate>20161131</StartDate>
       <EndDate>20170231</EndDate>
     </Facility>
   </Person>

最佳答案

您需要的是过滤/移除所有具有值小于Facility的子EndDate节点的20170199节点（以保留值大于20170199的节点）。
使用DomDocument和DomXPath类的解决方案：

$doc = new DOMDocument();
//$doc->preserveWhiteSpace = false;
$doc->load("test.xml");

$person = $doc->getElementsByTagName('Person')->item(0);  // context node
$xpath = new DOMXPath($doc);

foreach ($xpath->query('Facility[EndDate <= 20170199]', $person) as $n) {
    $person->removeChild($n);
}
echo $doc->saveXML($person);

输出：

<Person>
     <Name>John</Name>
     <LastName>Doe</LastName>

     <Facility>
       <TypeFacility>2</TypeFacility>
       <StartDate>20161131</StartDate>
       <EndDate>20170231</EndDate>
     </Facility>
   </Person>

DEMO link