$ar = array( "auth" => array( "user" => "customer", "password" => "password", "context" => "4", ), "owner" => array( "user" => "customer2", "context" => "4", ), "language" => "en", "task" => array( "code" => "0130", ), );$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>原文：http://www.cnblogs.com/M-D-Luffy/p/4929359.html