如何使用php将节点附加到xml文件中的父节点

Question

我想在xml文件中替换注释标签的值。我可以用php替换它.given是file.xml

<SyncOpportunity_Input>
<SendConfirmationEmail/>
<UpdateToken/>
<CallingSystem>WS-TEST</CallingSystem>
<KeepLocking/>
<Error_spcCode/>
<EmailAddrOverwrite/>
<Opportunity>
//<IntegrationId>12</IntegrationId>
//<LoanWriterId>13</LoanWriterId>
//<Description>NA</Description>
<Applicant>
<integratedid1>28</integratedid1>
<FirstName>pri</FirstName>
<LastName>kj</LastName>
</Applicant>
<Property>
<integratedid>2</integratedid>
<Title>Mr</Title>
<DateOfBirth>1999-11-11</DateOfBirth>
</Property>
<Ownership>
<integratedid1>28</integratedid1>
<OwnershipPercentage>100</OwnershipPercentage>
</Ownership>
</Opportunity>
</SyncOpportunity_Input>

我不想每次都创建节点..我只想替换子节点的值。我正在使用php动态附加其他标签。

这是我的function.php文件，其中我附加了其他标签，其中我有标签，然后创建子节点，每个标签的值来自我们的PHP表单。每次我们需要删除以前的数据

$xml = new DOMDocument('1.0', 'utf-8');
$xml->formatOutput = true;
$xml->preserveWhiteSpace = false;
$nodesToDelete=array();
$pnodesToDelete=array();
//echo $fname;

$xml->load('file.xml');
$nodesToDelete=array();
$IntegrationId =  rand(1,19);
$IntegrationId1 =  rand(10,30);
$IntegrationId2 =  rand(20,40);
$element = $xml->getElementsByTagName('Applicant')->item(0);

$pelement = $xml->getElementsByTagName('Property')->item(0);
$FirstName = $element->getElementsByTagName('FirstName')->item(0);
$LastName = $element->getElementsByTagName('LastName')->item(0);
//echo $timestamp;
//$oelement = $xml->getElementsByTagName('Opportunity');
$oelement = $xml->getElementsByTagName('Ownership')->item(0);;

$ownItem= $xml->createElement('Ownership');
$ownItem->appendChild($xml->createElement('integratedid1',$IntegrationId1 ));
$ownItem->appendChild($xml->createElement('OwnershipPercentage',100));


//$oItem->appendChild($xml->createElement('integratedid2',$IntegrationId2));

$newItem= $xml->createElement('Applicant');
$newItem->appendChild($xml->createElement('integratedid1',$IntegrationId1 ));
$newItem->appendChild($xml->createElement('FirstName', $_POST['fld_2260636']));
$newItem->appendChild($xml->createElement('LastName', $_POST['fld_4322743']));

$pnewItem= $xml->createElement('Property');
$pnewItem->appendChild($xml->createElement('integratedid',$IntegrationId ));
$pnewItem->appendChild($xml->createElement('Title', $_POST['fld_4755553']));
$pnewItem->appendChild($xml->createElement('DateOfBirth', $_POST['fld_1151367']));
//echo $newItem;


$xml->getElementsByTagName('Opportunity')->item(0)->appendChild($newItem);
$xml->getElementsByTagName('Opportunity')->item(0)->appendChild($pnewItem);
$xml->getElementsByTagName('Opportunity')->item(0)->appendChild($ownItem);
    $nodesToDelete[]=$element;
    $pnodesToDelete[]=$pelement;
    $onodesToDelete[]=$oelement;