我想能够编辑XML头标记

Question

下面这篇文章Saving form data to an existing XML-file using PHP

我想知道我怎么可以保存多个变量到XML文件中。使用描述的方法我只能保存最后一个。

我发现了一个方法的工作，因为我想

$xml="\n\t\t<Bares>\n\t\t";  
    { 
     while ($stmt->fetch()){ 

       $xml .="<Bar>\n\t\t"; 
       $xml .= "<nome>".$nome."</nome>\n\t\t"; 
       $xml .= "<morada>".$morada."</morada>\n\t\t"; 
       $xml .= "<nif>".$nif."</nif>\n\t\t"; 
       $xml .= "<telefone>".$telefone."</telefone>\n\t\t"; 
       $xml .= "<email>".$email."</email>\n\t\t"; 
       $xml .= "<imgid>".$imgid."</imgid>\n\t\t"; 
       $xml.="</Bar>\n\t"; 

     } 

      $xml.="</Bares>\n\r"; 

      $doc = new DOMDocument('1.0'); 
      $doc->formatOutput = true; 
      $doc->preserveWhiteSpace = true; 
      $doc->loadXML($xml, LIBXML_NOBLANKS); 
      $doc->save('dados.xml');     

，但我想能够编辑XML头标记（XML版本=“1.0”？），我不能做这样

Answer 1

再次考虑使用DOMDocument()方法，而不是使用字符串连接构建XML。使用PHP的信息手册，显示了如何添加一个Document Type Declaration (DTD)和XSLT processing line：

// Create an instance of the DOMImplementation class 
$imp = new DOMImplementation;  
// Create a DOMDocumentType instance 
$dtd = $imp->createDocumentType('graph', '', 'graph.dtd'); 

// Create a DOMDocument instance 
$doc = $imp->createDocument();  
// Set other properties 
$doc->encoding = 'UTF-8'; $doc->standalone = true; 
$doc->formatOutput = true; $doc->preserveWhiteSpace = true; 

// Create an XSLT adding processing line 
$xslt = $doc->createProcessingInstruction('xml-stylesheet', 
              'type="text/xsl" href="base.xsl"');  
// Append XSLT instruction to the doc 
$doc->appendChild($xslt); 
// Append DTD to the doc 
$doc->appendChild($dtd); 

// Create root 
$root = $doc->appendChild($doc->createElement('Bares')); 

// Iteratively append the elements (with values) 
while ($stmt->fetch()){       
    $barNode = $root->appendChild($doc->createElement('bare')); 
    $nomeNode = $barNode->appendChild($doc->createElement('nom', $nome)); 
    $moradaNode = $barNode->appendChild($doc->createElement('morada', $morada));     
    $nifNode = $barNode->appendChild($doc->createElement('nif', $nif)); 
    $telefoneNode = $barNode->appendChild($doc->createElement('telefone', $telefone)); 
    $emailNode = $barNode->appendChild($doc->createElement('email', $email)); 
    $imgidNode = $barNode->appendChild($doc->createElement('imgid', $imgid));   
} 

$doc->save('dados.xml');