使用PHP从XML删除空标签 [英] Remove empty tags from a XML with PHP

问题描述

如何在PHP中删除空的xml标记?

How can I remove empty xml tags in PHP?

 $value1 = "2";
 $value2 = "4";
 $value3 = "";

 xml = '<parentnode>
        <tag1> ' .$value1. '</tag1>
        <tag2> ' .$value2. '</tag2>
        <tag3> ' .$value3. '</tag3>
       </parentnode>';

XML结果:

<parentnode>
    <tag1>2</tag1>
    <tag2>4</tag2>
    <tag3></tag3> // <- Empty tag
</parentnode>

我想要什么！

    <parentnode>
            <tag1>2</tag1>
            <tag2>4</tag2> 
    </parentnode>

没有空标签(例如"tag3")的XML

The XML without the empty tags like "tag3"

谢谢！

推荐答案

您可以将 XPath 与

You can use XPath with the predicate not(node()) to select all elements that do not have child nodes.

<?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();

打印

<?xml version="1.0"?>
<parentnode>
  <tag1>2</tag1>
  <tag2>4</tag2>
  <tag2>4</tag2>
  <tag2>4</tag2>
</parentnode>

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