Php 如何在第一个元素xpath中找到元素的出现位置

使用如下XML结构：

<w:document>
    <w:body>
      <w:p>{textcontent}</w:p>
      <w:p>
          <w:drawing>
          </w:drawing>
      </w:p>
      <w:p>{no textcontent}</w:p>
      <w:p>
          <w:drawing>
          </w:drawing>
      </w:p>
      <w:p>{no textcontent}</w:p>
      <w:p>text..</w:p>

      <w:tbl>three</w:tbl>
      <w:p>four</w:p>
  </w:body>
</w:document>

但是我还需要p的索引（

$pindex

）

我还尝试了

evaluate（'/child'）

，

evaluate（'node（）/child'）

，但没有成功

---

我的表达式出了什么问题？

严格从xpath的角度来看：

添加

<root  xmlns:w='http://schemas.openxmlformats.org/wordprocessingml/2006/main'>
[your xml above]
</root>

给出了输出：

2.0

如果需要整数而不是浮点，请将表达式更改为

round(count(//w:p/w:drawing))

---

希望这对其他方面有所帮助。

严格从xpath的角度来看：

添加

<root  xmlns:w='http://schemas.openxmlformats.org/wordprocessingml/2006/main'>
[your xml above]
</root>

给出了输出：

2.0

如果需要整数而不是浮点，请将表达式更改为

round(count(//w:p/w:drawing))

---

希望这对其他人有帮助。

我实际上找到了我自己问题的答案：-）

而不是：

$document = new DOMDocument(); 
$document->loadXML($xml_str);
$xpath = new DOMXpath($document);
$xpath->registerNamespace(
   'wspace', 'http://schemas.openxmlformats.org/wordprocessingml/2006/main'
);

$pindex = 0;
foreach ($xpath->evaluate('//wspace:p') as $index => $p_node) 
{
    if (strlen($p_node->textContent)>0) {

        //I just want to know if drawing exists in this $p_node..
        //if the the node contains any content
        $child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);
        var_dump($child_nodes[0]);
        $pindex++;
        //But I get an object for each pnode. I just want an object when there
        //is an actualy <w:drawing> inside of <p> (item with index 1,3 in above example)
    }
}   

$child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);

$child_nodes = $p_node->childNodes;
foreach($child_nodes as $rc) 
{
    if ($rc->localName == 'drawing') 
    {
     $img_count++;
     echo 'P=' . $pindex;
    }
}

我只是在当前$p_节点上使用childNodes:

$document = new DOMDocument(); 
$document->loadXML($xml_str);
$xpath = new DOMXpath($document);
$xpath->registerNamespace(
   'wspace', 'http://schemas.openxmlformats.org/wordprocessingml/2006/main'
);

$pindex = 0;
foreach ($xpath->evaluate('//wspace:p') as $index => $p_node) 
{
    if (strlen($p_node->textContent)>0) {

        //I just want to know if drawing exists in this $p_node..
        //if the the node contains any content
        $child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);
        var_dump($child_nodes[0]);
        $pindex++;
        //But I get an object for each pnode. I just want an object when there
        //is an actualy <w:drawing> inside of <p> (item with index 1,3 in above example)
    }
}   

$child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);

$child_nodes = $p_node->childNodes;
foreach($child_nodes as $rc) 
{
    if ($rc->localName == 'drawing') 
    {
     $img_count++;
     echo 'P=' . $pindex;
    }
}

---

事实上，我找到了我自己问题的答案：-）

而不是：

$document = new DOMDocument(); 
$document->loadXML($xml_str);
$xpath = new DOMXpath($document);
$xpath->registerNamespace(
   'wspace', 'http://schemas.openxmlformats.org/wordprocessingml/2006/main'
);

$pindex = 0;
foreach ($xpath->evaluate('//wspace:p') as $index => $p_node) 
{
    if (strlen($p_node->textContent)>0) {

        //I just want to know if drawing exists in this $p_node..
        //if the the node contains any content
        $child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);
        var_dump($child_nodes[0]);
        $pindex++;
        //But I get an object for each pnode. I just want an object when there
        //is an actualy <w:drawing> inside of <p> (item with index 1,3 in above example)
    }
}   

$child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);

$child_nodes = $p_node->childNodes;
foreach($child_nodes as $rc) 
{
    if ($rc->localName == 'drawing') 
    {
     $img_count++;
     echo 'P=' . $pindex;
    }
}

我只是在当前$p_节点上使用childNodes:

$document = new DOMDocument(); 
$document->loadXML($xml_str);
$xpath = new DOMXpath($document);
$xpath->registerNamespace(
   'wspace', 'http://schemas.openxmlformats.org/wordprocessingml/2006/main'
);

$pindex = 0;
foreach ($xpath->evaluate('//wspace:p') as $index => $p_node) 
{
    if (strlen($p_node->textContent)>0) {

        //I just want to know if drawing exists in this $p_node..
        //if the the node contains any content
        $child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);
        var_dump($child_nodes[0]);
        $pindex++;
        //But I get an object for each pnode. I just want an object when there
        //is an actualy <w:drawing> inside of <p> (item with index 1,3 in above example)
    }
}   

$child_nodes = $xpath->evaluate('//wspace:drawing', $p_node);

$child_nodes = $p_node->childNodes;
foreach($child_nodes as $rc) 
{
    if ($rc->localName == 'drawing') 
    {
     $img_count++;
     echo 'P=' . $pindex;
    }
}

---

我不只是想数一数发生的事情。我还需要的与获取相关的索引。我不想只计算发生次数。我还需要的与获取相关的索引。