php array轉xml, json

轉json就沒什麼好說的了，想說轉xml應該也是很簡單的東西，不過還真遇到一些問題

1. array to xml
   原本在google了一段code後，後來發現有中文xml會掛掉因為有不合法字元，
   後來找到以下的code有編碼過，才知道原是編碼的問題
   

   function toXml($data = array(), $structure = NULL, $basenode = 'xml'){
      // turn off compatibility mode as simple xml throws a wobbly if you don't.
      if (ini_get('zend.ze1_compatibility_mode') == 1)
      {
         ini_set('zend.ze1_compatibility_mode', 0);
      }
   
      if ($structure == NULL)
      {
      $structure = simplexml_load_string("<?xml version='1.0' encoding='utf-8'?><$basenode />");
      }
   
      // loop through the data passed in.
      $data = $this->_force_loopable($data);
      foreach ($data as $key => $value)
      {
         // no numeric keys in our xml please!
         if (is_numeric($key))
         {
            // make string key...
            //$key = "item_". (string) $key;
            $key = "item";
         }
   
         // replace anything not alpha numeric
         $key = preg_replace('/[^a-z_]/i', '', $key);
   
         // if there is another array found recrusively call this function
         if (is_array($value) OR is_object($value))
         {
            $node = $structure->addChild($key);
            // recrusive call.
            $this->_format_xml($value, $node, $basenode);
         }
         else
         {
           // Actual boolean values need to be converted to numbers
           is_bool($value) AND $value = (int) $value;
   
           // add single node.
           $value = htmlspecialchars(html_entity_decode($value, ENT_QUOTES, 'UTF-8'), ENT_QUOTES, "UTF-8");
   
            $UsedKeys[] = $key;
   
            $structure->addChild($key, $value);
         }
      }
   
      // pass back as string. or simple xml object if you want!
      return $structure->asXML();
   }
   
   function _force_loopable($data){
      // Force it to be something useful
      if ( ! is_array($data) AND ! is_object($data))
      {
         $data = (array) $data;
      }
   
   return $data;
   }
   

2. 下header
   browser才會當成xml,而不是html
   

   $array = array(...);
   header('Content-type: application/xml;charset=utf-8');
   exit(toXml($array)) ;
   

結合一下兩者，利用同一個function回覆

//給header用
$_supported_formats = array(
                'xml' => 'application/xml',
                'rawxml' => 'application/xml',
                'json' => 'application/json',
                'jsonp' => 'application/javascript',
                'serialize' => 'application/vnd.php.serialized',
                'php' => 'text/plain',
                'html' => 'text/html',
                'csv' => 'application/csv'
        );


function response($data, $format = 'json'){
    header('Content-type: '.$this->_supported_formats[$format]);
    switch (strtolower($format)){
        case 'xml':                                
                exit($this->toXml($data));
        case 'json':
        default:
            exit(json_encode($data));
    }
}