php数组转xml

<span style="font-family: Arial, Helvetica, sans-serif;">$ar = array( </span>

"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>