奇怪的是：你已经知道你使用过的答案它在你的脚本中， getElementsByTagName（）。

但是这次不用DOMDocument作为上下文节点，但使用输入 DOMElement：

 <？php 
 $ doc = getDoc（）; 
 foreach（$ doc-> getElementsByTagName（'required'）as $ e）{
 $ e = $ e-> parentNode; //这应该是< input>元素
 // all< label>作为该< input>的直接子项的元素元素
 foreach（$ e-> getElementsByTagName（'label'）as $ l）{
 echo'label ='，$ 1-> nodeValue，\\\\
; 
} 
} 

函数getDoc（）{
 $ doc = new DOMDocument; 
 $ doc-> loadxml（'< foo> 
< input id =name> 
< label>全名：< / label> 
 < required /> 
< / input> 
< input id =phone> 
< required /> 
< / input> 
< input id =email/> 
< / foo>'）; 
 return $ doc; 
} 
 

打印 label =全名：

I am walking through a xml definition file and I have a DOMNodeList that I am walking through. I need to extract the contents of a child tag that may or may not be in the current entity

<input id="name">
  <label>Full Name:</label>
  <required />
</input>
<input id="phone">
  <required />
</input>
<input id="email" />

I need to replace ????????????? with something that gets me the contents of the label tag if it exists.

Code:

foreach($dom->getElementsByTagName('required') as $required){
  $curr = $required->parentNode;

  $label[$curr->getAttribute('id')] = ?????????????
}

Expected Result:

Array(
  ['name'] => "Full Name:"
  ['phone'] => 
)

Strange thing is: you already know the answer since you've used it in your script, getElementsByTagName().
But this time not with the DOMDocument as context "node" but with the input DOMElement:

<?php
$doc = getDoc();
foreach( $doc->getElementsByTagName('required') as $e ) {
  $e = $e->parentNode; // this should be the <input> element
  // all <label> elements that are direct children of this <input> element
  foreach( $e->getElementsByTagName('label') as $l ) {
    echo 'label="', $l->nodeValue, "\"\n";
  }
}

function getDoc() {
  $doc = new DOMDocument;
  $doc->loadxml('<foo>
    <input id="name">
      <label>Full Name:</label>
      <required />
    </input>
    <input id="phone">
      <required />
    </input>
    <input id="email" />
  </foo>');
  return $doc;
}

prints label="Full Name:"