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先来看看调用方法

$xml = new MySQL2XML(array("host"=>"localhost", "username"=>"root", "password"=>"", "database"=>"mysql"));
$xml->setTables(array("wp_term_relationships","wp_terms"));//设置备份的表
$xml->setSaveFolder("datas/");//保存备份文件的文件夹
$xml->toXML();//备份开始
?>

下面是这个互相转换程序的类型文件

class MySQL2XML {
        protected $conn;
        protected $result;
        protected $tables;
        protected $saveFolder = "datas/";
       
        public function __construct($config = NULL) {
                if($config !== NULL && is_array($config)) {
                        $this->connect($config);
                }
        }
       
        public function connect($config) {
                $this->conn = mysql_connect($config["host"], $config["username"], $config["password"]);
                if($this->conn) {
                        mysql_select_db($config["database"]);
                        return true;
                }
                return false;
        }
       
        public function setSaveFolder($folder) {
                if(is_dir($folder)) {
                        $this->saveFolder = rtrim(str_replace("\", "/", $folder),"/");
                        return true;
                }
                return false;
        }
       
        public function setTables($tables) {
                if(is_array($tables)) {
                        $this->tables = $tables;
                        return true;
                }
                return false;
        }
       
        public function query($query) {
                if(!isset($query) || trim($query) == "") return false;
                $this->result = mysql_query($query);
                if($this->result) return true;
                return false;
        }
       
        public function toXML() {
                if(!isset($this->tables)) return false;
                foreach($this->tables as $table) {
                        $file = $this->saveFolder.$table.".xml";
                        $fp = @fopen($file, "w");
                        if(!$fp) exit("Can not write file");
                        fwrite($fp, $this->tableToXML($table));
                        fclose($fp);
                        unset($fp);
                }
                return true;
        }
       
        public function tableToXML($table) {
                header("content-type:text/xml;charset=utf-8");
                $xml = "nn";
                $fields = $this->getFields($table);
                $datas = $this->getDatas($table);
                $cdata = array();
                foreach($datas as $data) {
                        foreach($data as $key => $value)
                                $cdata[$key][] = $value;
                }
                foreach($fields as $element) {
                        $xml .= "tn";
                        foreach($cdata[$element["Field"]] as $value) {
                                $xml .= "tt{$value}n";
                        }
                        $xml .= "tn";
                }
                $xml .= "";
                return $xml;
        }
       
        protected function getFields($table) {
                $query = "SHOW FIELDS FROM {$table}";
                $this->query($query);
                return $this->fetchAll();
        }
       
        protected function getDatas($table) {
                $query = "SELECT * FROM {$table}";
                $this->query($query);
                return $this->fetchAll();
        }
       
        protected function fetch() {
                if(is_resource($this->result)) {
                        return mysql_fetch_assoc($this->result);
                }
                return false;
        }
       
        protected function fetchAll() {
                if(is_resource($this->result)) {
                        $return = array();
                        $row = NULL;
                        while($row = mysql_fetch_assoc($this->result)) {
                                $return[] = $row;
                        }
                        return $return;
                }
                return false;
        }
}
?>

本文来源：http://www.gdgbn.com/bangongshuma/20373/