XPath查詢返回的多個節點

Question

PHP XPath查詢：

$query = $xpathvar->query('//siri:Service'); 
foreach($query as $service) { 
    echo $service->textContent; 
    // Here I need to also echo this Vehicle's reg 
} 

針對性的XML：

<Vehicle> 
    <CategoryA> 
     <Service>123123123</Service> 
    </CategoryA> 
    <CategoryB> 
     <SubCategoryA> 
      <Reg>ASDF_XC1</Reg> 
     </SubCategoryA> 
    </CategoryB> 
</Vehicle> 
// Imagine many more vehicles here each with a service and reg 

我怎樣才能改變PHP，這樣我也找回了reg爲每一個以及？ Service和Reg必須在檢索時位於同一輛車內（不是隨機對）。

Answer 1

如何查詢車輛，然後使用它作爲上下文節點來搜索Service和Reg？

$vehicles = $xpath->query('//siri:Vehicle'); 
$pairs = array(); 
foreach ($vehicles as $vehicle) { 
    $pairs[] = array(
     'Service' => $xpath->evaluate('string(.//siri:Service)', $vehicle), 
     'Reg'  => $xpath->evaluate('string(.//siri:Reg)' , $vehicle), 
    ); 
} 

看得那麼清楚：

• Combining two Xpaths into one loop?