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php-删除XML空节点

xml php

MB34 · 技术社区 · 6 年前

我发现此代码用于从和XML文件中删除空节点,但它无法正常工作。它会留下一个真正需要删除的空节点。是的,它是空的,只是里面有空白。

$domxml = new DOMDocument('1.0');
$domxml->preserveWhiteSpace = false;
$domxml->formatOutput = true;
$domxml->loadXML($this->response);
$this->response = $domxml->saveXML($domxml->documentElement);

有人知道更好的方法吗?

2 回复 | 直到 6 年前

ThW 6 年前

normalize-space()

//*

normalize-space(.) = ""
not(@*)
not(.//node()[normalize-space(.) != ""])
not(.//*[@*])
parent::*

$xml = <<<'XML'
<foo>
  <bar></bar>
  <bar>123</bar>
  <bar foo="123"></bar>
  <bar><foo>   </foo></bar>
  <bar><!-- test --></bar>
</foo>
XML;

$document = new DOMDocument();
$document->preserveWhiteSpace = FALSE;
$document->formatOutput = TRUE; 
$document->loadXml($xml);
$xpath = new DOMXpath($document);

$expression = 
  '//*[
    normalize-space(.) = "" and 
    not(@*) and  
    not(.//node()[normalize-space(.) != ""]) and 
    not(.//*[@*]) and
    parent::*
  ]';

$nodes = $xpath->evaluate($expression);
for ($i = $nodes->length - 1; $i >= 0; $i--) {
  $nodes[$i]->parentNode->removeChild($nodes[$i]);
}

echo $document->saveXml();

<?xml version="1.0"?>
<foo>
  <bar>123</bar>
  <bar foo="123"/>
  <bar>
    <!-- test -->
  </bar>
</foo>

Parfait 6 年前

* [.='']

XSLT Fiddle Demo

<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output version="1.0" encoding="UTF-8" indent="yes" />
<xsl:strip-space elements="*"/>

  <!-- Identity Transform to Copy Document as is -->
  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>

  <!-- Empty Template to Remove Empty Nodes -->
  <xsl:template match="*[.='']"/>

</xsl:transform>

// LOAD XML
$xml = new DOMDocument('1.0', 'UTF-8');
$xml->load('Input.xml');

// LOAD XSLT 
$xsl = new DOMDocument('1.0', 'UTF-8');   
$xsl->load('XSLT_Script.xsl');

// INITIALIZE TRANSFORMER
$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl);

// RUN TRANSFORMATION
$newXML = $proc->transformToXML($xml);

// SAVE NEW TREE TO FILE
echo $newXML;
file_put_contents('Output.xml', $newXML);

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