blocks|key|169936|text|$dom+=+new+DOMDocument;

$dom->loadXML($xml);

$elements+=+$dom->getElementsByTagName('*');

foreach($elements+as+$element)+{

+++if+(+!+$element->hasChildNodes()+OR+$element->nodeValue+==+'')+{
+++++++$element->parentNode->removeChild($element);
+++}

}+

echo+$dom->saveXML();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|169937|CodePad。|unstyled|offset|length|169938|entityMap|0|LINK|mutability|MUTABLE|url|http://codepad.viper-7.com/hDtzrS^0|0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>$dom = new DOMDocument;

$dom-&gt;loadXML($xml);

$elements = $dom-&gt;getElementsByTagName('*');

foreach($elements as $element) {

   if ( ! $element-&gt;hasChildNodes() OR $element-&gt;nodeValue == '') {
       $element-&gt;parentNode-&gt;removeChild($element);
   }

} 

echo $dom-&gt;saveXML();
</code></pre>

<p><a href="http://codepad.viper-7.com/hDtzrS" rel="noreferrer">CodePad</a>.</p>


blocks|key|1188972|text|如果你想做很多这样的事情，只需要做一些如下的事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1188973|$value[]+=+"2";
$value[]+=+"4";
$value[]+=+"";+++

$xml+=+'<parentnode>';
for($i=1,$m=count($value);+$i<$m%2B1;+$i%2B%2B)
++++++$xml+.=+!empty($value[$i-1])+?+"<tag{$i}>{$value[$i-1]}</tag{$i}>"+:+null;
$xml+.=+'</parentnode>';
echo+$xml;|code-block|syntax|javascript|1188974|不过，理想情况下，您可能应该使用domdocument。|offset|length|1188975|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/domdocument.createelement.php^0|0|0|G|B|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<p>If you're going to be a lot of this, just do something like:</p>

<pre><code>$value[] = "2";
$value[] = "4";
$value[] = "";   

$xml = '&lt;parentnode&gt;';
for($i=1,$m=count($value); $i&lt;$m+1; $i++)
      $xml .= !empty($value[$i-1]) ? "&lt;tag{$i}&gt;{$value[$i-1]}&lt;/tag{$i}&gt;" : null;
$xml .= '&lt;/parentnode&gt;';
echo $xml;
</code></pre>

<p>Ideally though, you should probably use <a href="http://php.net/manual/en/domdocument.createelement.php" rel="nofollow">domdocument</a>.</p>


blocks|key|5530222|text|可以结合使用XPath和predicate+not(node())来选择没有子节点的所有元素。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5530223|<?php
$doc+=+new+DOMDocument;
$doc->preserveWhiteSpace+=+false;
$doc->loadxml('<parentnode>
++++<tag1>2</tag1>
++++<tag2>4</tag2>
++++<tag3></tag3>
++++<tag2>4</tag2>
++++<tag3></tag3>
++++<tag2>4</tag2>
++++<tag3></tag3>
</parentnode>');

$xpath+=+new+DOMXPath($doc);

foreach(+$xpath->query('//*[not(node())]')+as+$node+)+{
++++$node->parentNode->removeChild($node);
}

$doc->formatOutput+=+true;
echo+$doc->savexml();|code-block|syntax|javascript|5530224|打印|5530225|<?xml+version="1.0"?>
<parentnode>
++<tag1>2</tag1>
++<tag2>4</tag2>
++<tag2>4</tag2>
++<tag2>4</tag2>
</parentnode>|5530226|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.php.net/DOMXPath|1|http://www.w3.org/TR/xpath/#predicates^0|M|B|6|5|0|C|9|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]|$9|14|A|15|1|16]]|E|$]]|$1|F|3|G|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|18|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

<p>You can use <a href="http://docs.php.net/DOMXPath">XPath</a> with the <a href="http://www.w3.org/TR/xpath/#predicates">predicate</a> <code>not(node())</code> to select all elements that do not have child nodes.</p>

<pre><code>&lt;?php
$doc = new DOMDocument;
$doc-&gt;preserveWhiteSpace = false;
$doc-&gt;loadxml('&lt;parentnode&gt;
    &lt;tag1&gt;2&lt;/tag1&gt;
    &lt;tag2&gt;4&lt;/tag2&gt;
    &lt;tag3&gt;&lt;/tag3&gt;
    &lt;tag2&gt;4&lt;/tag2&gt;
    &lt;tag3&gt;&lt;/tag3&gt;
    &lt;tag2&gt;4&lt;/tag2&gt;
    &lt;tag3&gt;&lt;/tag3&gt;
&lt;/parentnode&gt;');

$xpath = new DOMXPath($doc);

foreach( $xpath-&gt;query('//*[not(node())]') as $node ) {
    $node-&gt;parentNode-&gt;removeChild($node);
}

$doc-&gt;formatOutput = true;
echo $doc-&gt;savexml();
</code></pre>

<p>prints </p>

<pre><code>&lt;?xml version="1.0"?&gt;
&lt;parentnode&gt;
  &lt;tag1&gt;2&lt;/tag1&gt;
  &lt;tag2&gt;4&lt;/tag2&gt;
  &lt;tag2&gt;4&lt;/tag2&gt;
  &lt;tag2&gt;4&lt;/tag2&gt;
&lt;/parentnode&gt;
</code></pre>


blocks|key|5530279|text|通过使用Xpath，我的生产PHP目标代码的解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5530280|/*
+*+Remove+empty+(no+children)+and+blank+(no+text)+XML+element+nodes,+but+not+an+empty+root+element+(/child::*).
+*+This+does+not+work+recursively;+meaning+after+empty+child+elements+are+removed,+parents+are+not+reexamined.
+*/
foreach(+$this->xml->xpath('/child::*//*[not(*)+and+not(text()[normalize-space()])]')+as+$emptyElement+)+{
++++unset(+$emptyElement[0]+);
}|code-block|syntax|javascript|5530281|注意，不需要使用PHP+DOM、DOMDocument、DOMXPath或dom_import_simplexml()。|5530282|//this+is+a+recursively+option

do+{
++++$removed+=+false;
++++foreach(+$this->xml->xpath('/child::*//*[not(*)+and+not(text()[normalize-space()])]')+as+$emptyElement+)+{
++++++++unset(+$emptyElement[0]+);
++++++++$removed+=+true;
++++}
}+while+($removed)+;|5530283|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>The solution that worked with my production PHP SimpleXMLElement object code, by using Xpath, was:</p>

<pre><code>/*
 * Remove empty (no children) and blank (no text) XML element nodes, but not an empty root element (/child::*).
 * This does not work recursively; meaning after empty child elements are removed, parents are not reexamined.
 */
foreach( $this-&gt;xml-&gt;xpath('/child::*//*[not(*) and not(text()[normalize-space()])]') as $emptyElement ) {
    unset( $emptyElement[0] );
}
</code></pre>

<p>Note that it is not required to use PHP DOM, DOMDocument, DOMXPath, or dom_import_simplexml().</p>

<pre><code>//this is a recursively option

do {
    $removed = false;
    foreach( $this-&gt;xml-&gt;xpath('/child::*//*[not(*) and not(text()[normalize-space()])]') as $emptyElement ) {
        unset( $emptyElement[0] );
        $removed = true;
    }
} while ($removed) ;
</code></pre>


blocks|key|3915113|text|这将以递归方式工作，并删除符合以下条件的节点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3915114|3915115|contain+spaces|unordered-list-item|3915116|+not+have+attributes|3915117|+not+have子笔记|3915118|3915119|//+not(*)+does+not+have+children+elements
//+not(@*)+does+not+have+attributes
//+text()[normalize-space()]+nodes+that+include+whitespace+text
while+(($node_list+=+$xpath->query('//*[not(*)+and+not(@*)+and+not(text()[normalize-space()])]'))+&&+$node_list->length)+{
++++foreach+($node_list+as+$node)+{
++++++++$node->parentNode->removeChild($node);
++++}
}|code-block|syntax|javascript|3915120|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|U|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|V|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|X|8|@]|9|@]|A|$N|O]]|$1|P|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|Q|$]]

<p>This works recursively and removes nodes that:</p>

<ul>
<li>contain only spaces</li>
<li>do not have attributes</li>
<li>do not have child notes</li>
</ul>



<pre><code>// not(*) does not have children elements
// not(@*) does not have attributes
// text()[normalize-space()] nodes that include whitespace text
while (($node_list = $xpath-&gt;query('//*[not(*) and not(@*) and not(text()[normalize-space()])]')) &amp;&amp; $node_list-&gt;length) {
    foreach ($node_list as $node) {
        $node-&gt;parentNode-&gt;removeChild($node);
    }
}
</code></pre>


<h2>Question</h2>

<p>How can I remove empty xml tags in PHP?</p>

<h2>Example:</h2>

<pre><code> $value1 = "2";
 $value2 = "4";
 $value3 = "";

 xml = '&lt;parentnode&gt;
        &lt;tag1&gt; ' .$value1. '&lt;/tag1&gt;
        &lt;tag2&gt; ' .$value2. '&lt;/tag2&gt;
        &lt;tag3&gt; ' .$value3. '&lt;/tag3&gt;
       &lt;/parentnode&gt;';
</code></pre>

<h2>XML Result:</h2>

<pre><code>&lt;parentnode&gt;
    &lt;tag1&gt;2&lt;/tag1&gt;
    &lt;tag2&gt;4&lt;/tag2&gt;
    &lt;tag3&gt;&lt;/tag3&gt; // &lt;- Empty tag
&lt;/parentnode&gt;
</code></pre>

<h2>What I want!</h2>

<pre><code>    &lt;parentnode&gt;
            &lt;tag1&gt;2&lt;/tag1&gt;
            &lt;tag2&gt;4&lt;/tag2&gt; 
    &lt;/parentnode&gt;
</code></pre>

<p>The XML without the empty tags like "tag3"</p>

<p>Thanks!</p>


Remove empty tags from a XML with PHP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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问题如何在PHP中删除空的xml标记？示例： $value1 = "2"; $value2 = "4"; $value3 = ""; xml = '<parentnode>        <tag1> ' .$value1. '</tag1>        <tag2> ' .$value2. '</tag2>    ...

问使用PHP从XML中删除空标记
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