php数组转换成xml格式的实现方法

<?php
$elementLevel = 0 ;
function array_Xml($array, $keys = '')
{
global $elementLevel;
if(!is_array($array))
{
  if($keys == ''){
  return $array;
  }else{
  return "\n<$keys>" . $array . "</$keys>\n";
  }
}else{
  foreach ($array as $key => $value)
  {
  $haveTag = true;
  if (is_numeric($key))
  {
   $key = $keys;
   $haveTag = false;
  }
  if($elementLevel == 0 )
  {
   $startElement = "<$key>";
   $endElement = "</$key>";
  }
  $text .= $startElement;
  if(!$haveTag)
  {
   $elementLevel++;
   $text .= "<$key>" . array_Xml($value, $key). "</$key>\n";
  }else{
   $elementLevel++;
   $text .= array_Xml($value, $key);
  }
  $text .= $endElement;
  }
}
return $text;
}
$array = array(
"employees" => array(
"employee" => array(
array(
"name" => "name one",
"position" => "position one"
),
array(
"name" => "name two",
"position" => "position two"
),
array(
"name" => "name three",
"position" => "position three"
)
)
)
);
echo array_Xml($array);
?>