其他解决方案:

$marray=array(....);
$options = array(
                "encoding" => "UTF-8",
                "output_type" => "xml", 
                "version" => "simple",
                "escaping" => array("non-ascii, on-print, markup")
                );
$xmlres = xmlrpc_encode_request('root', $marray, $options);
print($xmlres);

基于这里的所有其他内容，通过前缀@处理数值索引+属性，并可以将xml注入到现有节点:

Code

function simple_xmlify($arr, SimpleXMLElement $root = null, $el = 'x') {
    // based on, among others http://stackoverflow.com/a/1397164/1037948

    if(!isset($root) || null == $root) $root = new SimpleXMLElement('<' . $el . '/>');

    if(is_array($arr)) {
        foreach($arr as $k => $v) {
            // special: attributes
            if(is_string($k) && $k[0] == '@') $root->addAttribute(substr($k, 1),$v);
            // normal: append
            else simple_xmlify($v, $root->addChild(
                    // fix 'invalid xml name' by prefixing numeric keys
                    is_numeric($k) ? 'n' . $k : $k)
                );
        }
    } else {
        $root[0] = $arr;
    }

    return $root;
}//--   fn  simple_xmlify

使用

// lazy declaration via "queryparam"
$args = 'hello=4&var[]=first&var[]=second&foo=1234&var[5]=fifth&var[sub][]=sub1&var[sub][]=sub2&var[sub][]=sub3&var[@name]=the-name&var[@attr2]=something-else&var[sub][@x]=4.356&var[sub][@y]=-9.2252';
$q = array();
parse_str($val, $q);

$xml = simple_xmlify($q); // dump $xml, or...
$result = get_formatted_xml($xml); // see below

结果

<?xml version="1.0"?>
<x>
  <hello>4</hello>
  <var name="the-name" attr2="something-else">
    <n0>first</n0>
    <n1>second</n1>
    <n5>fifth</n5>
    <sub x="4.356" y="-9.2252">
      <n0>sub1</n0>
      <n1>sub2</n1>
      <n2>sub3</n2>
    </sub>
  </var>
  <foo>1234</foo>
</x>

好处:格式化XML

function get_formatted_xml(SimpleXMLElement $xml, $domver = null, $preserveWhitespace = true, $formatOutput = true) {
    // http://stackoverflow.com/questions/1191167/format-output-of-simplexml-asxml

    // create new wrapper, so we can get formatting options
    $dom = new DOMDocument($domver);
    $dom->preserveWhiteSpace = $preserveWhitespace;
    $dom->formatOutput = $formatOutput;
    // now import the xml (converted to dom format)
    /*
    $ix = dom_import_simplexml($xml);
    $ix = $dom->importNode($ix, true);
    $dom->appendChild($ix);
    */
    $dom->loadXML($xml->asXML());

    // print
    return $dom->saveXML();
}//--   fn  get_formatted_xml

只是对上面的函数进行了编辑，当键是数字时，添加前缀“key_”

// initializing or creating array
$student_info = array(your array data);

// creating object of SimpleXMLElement
$xml_student_info = new SimpleXMLElement("<?xml version=\"1.0\"?><student_info></student_info>");

// function call to convert array to xml
array_to_xml($student,$xml_student_info);

//saving generated xml file
$xml_student_info->asXML('file path and name');


function array_to_xml($student_info, &$xml_student_info) {
     foreach($student_info as $key => $value) {
          if(is_array($value)) {
            if(!is_numeric($key)){
                $subnode = $xml_student_info->addChild("$key");
                array_to_xml($value, $subnode);
            }
            else{
                $subnode = $xml_student_info->addChild("key_$key");
                array_to_xml($value, $subnode);
            }
          }
          else {
               if(!is_numeric($key)){
                    $xml_student_info->addChild("$key","$value");
               }else{
                    $xml_student_info->addChild("key_$key","$value");
               }
          }
     }
}

这里提供的答案仅将数组转换为带节点的XML，不能设置属性。我已经编写了一个php函数，允许您将数组转换为php，并为xml中的特定节点设置属性。这里的缺点是您必须以很少约定的特定方式构造数组(仅当您想使用属性时)

下面的示例也允许您用XML设置属性。

来源可以在这里找到: https://github.com/digitickets/lalit/blob/master/src/Array2XML.php

<?php    
$books = array(
    '@attributes' => array(
        'type' => 'fiction'
    ),
    'book' => array(
        array(
            '@attributes' => array(
                'author' => 'George Orwell'
            ),
            'title' => '1984'
        ),
        array(
            '@attributes' => array(
                'author' => 'Isaac Asimov'
            ),
            'title' => 'Foundation',
            'price' => '$15.61'
        ),
        array(
            '@attributes' => array(
                'author' => 'Robert A Heinlein'
            ),
            'title' => 'Stranger in a Strange Land',
            'price' => array(
                '@attributes' => array(
                    'discount' => '10%'
                ),
                '@value' => '$18.00'
            )
        )
    )
);
/* creates 
<books type="fiction">
  <book author="George Orwell">
    <title>1984</title>
  </book>
  <book author="Isaac Asimov">
    <title>Foundation</title>
    <price>$15.61</price>
  </book>
  <book author="Robert A Heinlein">
    <title>Stranger in a Strange Land</title>
    <price discount="10%">$18.00</price>
  </book>
</books>
*/
?>

如果冗长的xml不成问题，可以使用xmlrpc_encode从数组创建xml。 www.php.net/xmlrpc_encode

注意，如果使用关联键和/或数字键，创建的XML会有所不同

<?php
// /params/param/value/struct/member
// there is a tag "member" for each element
// "member" contains a tag "name". its value is the associative key
$xml1 = xmlrpc_encode(array('a'=>'b','c'=>'d'));
$simplexml1 = simplexml_load_string($xml1);
print_r($xml1);
print_r($simplexml1);

// /params/param/value/array/data
// there is a tag "data" for each element
// "data" doesn't contain the tag "name"
$xml2 = xmlrpc_encode(array('a','b'));
$simplexml2 = simplexml_load_string($xml2);
print_r($xml2);
print_r($simplexml2);
?>

您可以直接在代码中使用以下函数，

    function artoxml($arr, $i=1,$flag=false){
    $sp = "";
    for($j=0;$j<=$i;$j++){
        $sp.=" ";
     }
    foreach($arr as $key=>$val){
        echo "$sp&lt;".$key."&gt;";
        if($i==1) echo "\n";
        if(is_array($val)){
            if(!$flag){echo"\n";}
            artoxml($val,$i+5);
            echo "$sp&lt;/".$key."&gt;\n";
        }else{
              echo "$val"."&lt;/".$key."&gt;\n";
         }
    }

}

调用第一个参数作为数组的函数，第二个参数必须为1，这将增加完美缩进，第三个参数必须为真。

例如，如果要转换的数组变量是$array1，那么， 调用时，调用函数应该封装在<pre>标记中。

Artoxml（$array 1，1，true）;

请在执行文件后查看页面源代码，因为<和>符号将不会显示在html页面中。