如何删除XML开始和结束之间的特殊字符？
我试过使用递归函数。所以在这种情况下它对我不起作用。

$sampleXML = '<?xml version="1.0" encoding="ISO-8859-1"?>  
<mainTag type="user">
<note>
    <PersonName>
        <GivenName>Replace & this</GivenName>
        <MiddleName>Replace < this</MiddleName>
    </PersonName>
    <Aliases>
        <PersonName>
            <GivenName>Replace > this</GivenName>
            <FamilyName>Replace " this</FamilyName>
        </PersonName>
    </Aliases>
    <DemographicDetail>
        <GovernmentId countryCode="US">testIDs data  </GovernmentId>
        <DateOfBirth>2000-12-12</DateOfBirth>
    </DemographicDetail>
</note>
<anothertag>
    <data type="credit">
        <Vendor score="yes"> vendor name  </Vendor>
    </data>
</anothertag>
</mainTag>';

$doc = new DOMDocument;
$doc->loadXML($xml);
$this->removeSpecialCharacterNodes($doc);
$xpath = new DOMXpath($doc);
$xml = $doc->saveXML($doc, LIBXML_NOEMPTYTAG);

替换以下内容

& by &
 > by <
 < by &gt;
" by &quot;
' by  &apos;

我已经使用了下面的递归代码，但它返回空值

public function removeSpecialCharacterNodes(DOMNode $node) {
        // echo "aa";
        // var_dump($node->childNodes);
        $str = $node->childNodes;
        var_dump($node->childNodes);
        foreach ($node->childNodes as $child){
          if($child->hasChildNodes()) {
            $this->removeSpecialCharacterNodes($child);
          } else{
                $child->nodeValue = str_ireplace('&', '&', $child->nodeValue);
          }
        }    
    }

更新：我已经使用了字符串替换和htmlspecialchars仍然没有更新特殊字符。

$doc = new DOMDocument;
$doc->loadXML( $sampleXML);

foreach ($doc->documentElement->childNodes as $node) {
    if($node->nodeType==1){
        $oldAddressLine = $node->getElementsByTagName('AddressLine')->Item(0);
        // $elle = str_ireplace(
        //  array( "'"),
        //  array( "'"), 
        //  $oldAddressLine->nodeValue
        // );
        // $newelement = $doc->createElement('AddressLine', $elle); 

        $chk = $oldAddressLine->nodeValue;
        $newelement = $doc->createElement('AddressLine', htmlspecialchars( $chk, ENT_XML1 )); 

        if ($oldAddressLine->parentNode != null) {
           $oldAddressLine->parentNode->replaceChild($newelement, $oldAddressLine);
        }
    }
 }

 $xpath = new DOMXpath($doc);

 $finalVal = $doc->saveXML($doc, LIBXML_NOEMPTYTAG);

 echo "<pre>".htmlentities($finalVal)."</pre>"; exit;