多维PHP数组如何转换成xml格式的数据？
PHP数组是这样的：

array(4) 
{ 
["auth"]=> array(3) 
{
["user"]=> string(8) "customer" 
["password"]=> string(8) "password" 
["context"]=> string(1) "4" 
} 
["owner"]=> array(2) 
{ 
["user"]=> string(9) "customer2" 
["context"]=> string(1) "4" 
} 
["language"]=> string(2) "en" 
["task"]=> array(1) 
{ 
["code"]=> string(4) "0130" 
} 
}

转换成xml格式后的数据格式是这样的：

<?xml version="1.0" encoding="utf-8"?>
<request>
<auth>
<user>customer</user>
<password>password</password>
<context>4</context>
</auth>
<owner>
<user>customer2</user>
<context>4</context>
</owner>
<language>en</language>
<task>
<code>0130</code>
</task>
</request>

php数组 xml
[解决办法]

 $ar=array
( 
"auth"=> array 
(
"user"=>  "customer" ,
"password"=>  "password" ,
"context"=>  "4" 
) ,
"owner"=> array 
( 
"user"=>  "customer2" ,
"context"=>  "4" 
) ,
"language"=>  "en" ,
"task"=> array
( 
"code"=>  "0130" 
) 
);


$doc = new DOMDocument('1.0','UTF-8');
// we want a nice output
$doc->formatOutput = true;

$root = $doc->createElement('request');
$root = $doc->appendChild($root);

 foreach($ar as $title=>$title_v){
   $title = $doc->createElement($title);
   $title = $root->appendChild($title); 
    if(is_array($title_v)){
       foreach($title_v as $k=>$v){
       $k = $doc->createElement($k);
           $k = $title->appendChild($k);
   $text = $doc->createTextNode($v);
           $text = $k->appendChild($text);
   } 
   }else{
       $text = $doc->createTextNode($title_v);
       $text = $title->appendChild($text);
   }
}

echo $doc->saveXML();

[解决办法]

$ar = array( 
"auth" => array( 
"user" => "customer",
"password" => "password",
"context" => "4",
),
"owner" => array( 
"user" => "customer2",
"context" => "4",
),
"language" => "en",
"task" => array( 
"code" => "0130",
), 
);
$xml = simplexml_load_string('<request />');
create($ar, $xml);
echo $xml->saveXML();

function create($ar, $xml) {
foreach($ar as $k=>$v) {
if(is_array($v)) {
$x = $xml->addChild($k);
create($v, $x);
}else $xml->addChild($k, $v);
}
}

<?xml version="1.0" ?> 
<request>
<auth>
<user>customer</user> 
<password>password</password> 
<context>4</context> 
</auth>
<owner>
<user>customer2</user> 
<context>4</context> 
</owner>
<language>en</language> 
<task>
<code>0130</code> 
</task>
</request>