如何在php中使用follow-sibling xpath查询？

Question

XML:

<Routes>
  <Route type="source" >
   <Table>
     <Tablename>incoming</Tablename>
     <Fields>
       <Fieldsname ref="dest">truegoto</Fieldsname>
     </Fields>
   </Table>
  </Route>
</Routes>

PHP:

$doc    = new SimpleXMLElement('routingConfig.xml', null, true);
$foo = $doc->xpath('/Routes/Route[@type="source"]/Table/Tablename[incoming]/following-sibling::Fields/Fieldsname[@ref="dest"]');
print_r($foo);

Trying to get truegoto by way of knowing <Tablename>incoming</Tablename>. My current code just returns an empty array : /

Answer 1

The problem isn't with the following-sibling part. By that point, you already have no nodes selected. This is because Tablename[incoming] means "Tablename elements that have a child element called incoming". You need Tablename[.="incoming"] instead, which tests the content of the element:

/Routes/Route[@type="source"]/Table/Tablename[.="incoming"]/following-sibling::Fields/Fieldsname[@ref="dest"]