PHP XML To Array将XML转换为数组

 // Xml 转 数组, 包括根键，忽略空元素和属性，尚有重大错误
 function xml_to_array( $xml )
 {
     $reg = "/<(\\w+)[^>]*?>([\\x00-\\xFF]*?)<\\/\\1>/";
     if(preg_match_all($reg, $xml, $matches))
     {
         $count = count($matches[0]);
         $arr = array();
         for($i = 0; $i < $count; $i++)
         {
             $key= $matches[1][$i];
             $val = xml_to_array( $matches[2][$i] );  // 递归
             if(array_key_exists($key, $arr))
             {
                 if(is_array($arr[$key]))
                 {
                     if(!array_key_exists(0,$arr[$key]))
                     {
                         $arr[$key] = array($arr[$key]);
                     }
                 }else{
                     $arr[$key] = array($arr[$key]);
                 }
                 $arr[$key][] = $val;
             }else{
                 $arr[$key] = $val;
             }
         }
         return $arr;
     }else{
         return $xml;
     }
 }
 // Xml 转 数组, 不包括根键
 function xmltoarray( $xml )
 {
     $arr = xml_to_array($xml);
     $key = array_keys($arr);
     return $arr[$key[0]];
 }

 // 类似 XPATH 的数组选择器
 function xml_array_select( $arr, $arrpath )
 {
     $arrpath = trim( $arrpath, '/' );
     if(!$arrpath) return $arr;
     $self = 'xml_array_select';

     $pos = strpos( $arrpath, '/' );
     $pos = $pos ? $pos : strlen($arrpath);
     $curpath = substr($arrpath, 0, $pos);
     $next = substr($arrpath, $pos);

     if(preg_match("/\\[(\\d+)\\]$/",$curpath,$predicate))
     {
         $curpath = substr($curpath, 0, strpos($curpath,"[{$predicate[1]}]"));
         $result = $arr[$curpath][$predicate[1]];
     }else $result = $arr[$curpath];

     if( is_array($arr) && !array_key_exists($curpath, $arr) )
     {
         die( 'key is not exists:' . $curpath );
     }

     return $self($result, $next);
 }
 // 如果输入的数组是全数字键，则将元素值依次传输到 $callback, 否则将自身传输给$callback
 function xml_array_each( $arr, $callback )
 {
     if(func_num_args()<2) die('parameters error');
     if(!is_array($arr)) die('parameter 1 shuld be an array!');
     if(!is_callable($callback)) die('parameter 2 shuld be an function!');
     $keys = array_keys($arr);
     $isok = true;
     foreach( $keys as $key ) {if(!is_int($key)) {$isok = false; break;}}
     if($isok)
         foreach( $arr as $val ) $result[] = $callback($val);
     else
         $result[] = $callback( $arr );
     return $result;
 }

/**
 * 最简单的XML转数组
 * @param string $xmlstring XML字符串
 * @return array XML数组
 */
function simplest_xml_to_array($xmlstring) {
    return json_decode(json_encode((array) simplexml_load_string($xmlstring)), true);
}