<?php
/**
* mysql数据库完整备份、备份数据库中指定表
* edit: www.
*/
   class Backup
       {
 /**
  * @var stores the options
  */
 var $config;

 /**
  * @var stores the final sql dump
  */
 var $dump;

 /**
  * @var stores the table structure + inserts for every table
  */
 var $struktur = array();

 /**
  * @var zip file name
  */
 var $datei;

 /**
  * this function is the constructor and phrase the options
  * and connect to the database
  * @return
  */
 public function Backup($options)
 {
         // write options
         foreach($options AS $name => $value)
         {
   $this->config[$name] = $value;
         }

         // check mysql connection
         mysql_connect()($this->config['mysql'][0], $this->config['mysql'][1], $this->config['mysql'][2]) or die(mysql_error());
         mysql_select_db($this->config['mysql'][3]) or die(mysql_error());
 }

 /**
  * this function start the backup progress its the core function
  * @return
  */
 public function backupDB()
 {
         // start backup
         if(isset()($_POST['backup']))
         {
   // check if tables are selected
   if(empty($_POST['table']))
   {
           die("Please select a table.");
   }

   /** start backup **/
   $tables = array();
   $insert = array();
   $sql_statement = '';

   // lock tables
   foreach($_POST['table'] AS $table)
   {
            mysql_query()("LOCK TABLE $table WRITE");

           // Read table structure
           $res = mysql_query('SHOW CREATE TABLE '.$table.'');
           $createtable = mysql_result($res, 0, 1);
           $str = "\n\n".$createtable."\n\n";

           array_push($tables, $str);

           // Read table "inserts"
             $sql = 'SELECT * FROM '.$table;
             $query = mysql_query($sql) or die(mysql_error());
             $feld_anzahl = mysql_num_fields($query);

           $sql_statement = '---- Data Table `$table`--';

           // start reading progress
             while($ds = mysql_fetch_object($query)){
   $sql_statement .= 'INSERT INTO `'.$table.'` (';

   for ($i = 0;$i <$feld_anzahl;$i++){
       if ($i ==$feld_anzahl-1){
           $sql_statement .= mysql_field_name($query,$i);
       } else {
           $sql_statement .= mysql_field_name($query,$i).', ';
       }
   }

   $sql_statement .= ') VALUES (';

   for ($i = 0;$i <$feld_anzahl;$i++){
       $name = mysql_field_name($query,$i);
       if (empty($ds->$name)){
           $ds->$name = 'NULL';
       }
       if ($i ==$feld_anzahl-1){
           $sql_statement .= '"'.$ds->$name.'"';
       } else {
           $sql_statement .= '"'.$ds->$name.'", ';
       }
   }
   $sql_statement .= ");\n";
             }

           // insert "Inserts" into an array if not exists
           if(!in_array($sql_statement, $insert))
           {
     array_push($insert, $sql_statement);
     unset($sql_statement);
           }

           unset($sql_statement);

   }

   // put table structure and inserts together in one var
   $this->struktur = array_combine($tables, $insert);

   // create full dump
   $this->createDUMP($this->struktur);

   // create zip file
   $this->createZIP();

   /** end backup **/

   // send an email with the sql dump
   if(isset($this->config['email']) && !empty($this->config['email']))
   {
           $this->sendEmail();
   }

   // output
   echo '<h3 >Backup war erfolgreich</h3><a href="'.$this->datei.'">Download Backup</a>
   <br />
   <br />';
         }
 }

 /**
  * this function generate an email with attachment
  * @return
  */
 protected function sendEmail()
 {
   // start sending emails
   foreach($this->config['email'] AS $email)
   {
           $to = $email;

           $from = $this->config['email'][0];

           $message_body = "This email contains the database backup as a zip file.";

           $msep = strtoupper() (md5 (uniqid (time ())));

           // set email header (only text)
           $header =
       "From: $from\r\n" .
       "MIME-Version: 1.0\r\n" .
       "Content-Type: multipart/mixed; boundary="$msep"\r\n\r\n" .
       "--$msep\r\n" .
       "Content-Type: text/plain\r\n" .
       "Content-Transfer-Encoding: 8bit\r\n\r\n" .
       $message_body . "\r\n";

           // file name
           $dateiname = $this->datei;

           // get filesize of zip file
           $dateigroesse = filesize ($dateiname);

           // open file to read
           $f = fopen ($dateiname, "r");
           // save content
           $attached_file = fread ($f, $dateigroesse);
           // close file
           fclose ($f);

           // create attachment
           $attachment = chunk_split() (base64_encode ($attached_file));

           // set attachment header
           $header .=
        "--" . $msep . "\r\n" .
        "Content-Type: application/zip; name='Backup'\r\n" .
        "Content-Transfer-Encoding: base64\r\n" .
        "Content-Disposition: attachment; filename='Backup.zip'\r\n" .
        "Content-Description: Mysql Datenbank Backup im Anhang\r\n\r\n" .
        $attachment . "\r\n";

           // mark end of attachment
           $header .= "--$msep--";

           // eMail Subject
           $subject = "Database Backup";

           // send email to emails^^
           if(mail($to, $subject, '', $header) == FALSE)
           {
     die("The email could not be sent. Please check the email address.");
           }

           echo "<p><small>Email was successfully sent.</small></p>";
   }
 }

 /**
  * this function create the zip file with the database dump and save it on the ftp server
  * @return
  */
 protected function createZIP()
 {

         // Set permissions to 777
         chmod($this->config['folder'], 0777);

         // create zip file
         $zip = new ZipArchive();
         // Create file name
         $this->datei = $this->config['folder'].$this->config['mysql'][3]."_".date("j_F_Y_g:i_a").".zip";

         // Checking if file could be created
         if ($zip->open($this->datei, ZIPARCHIVE::CREATE)!==TRUE) {
   exit("cannot open <".$this->datei.">\n");
         }

         // add mysql dump to zip file
         $zip->addFromString("dump.sql", $this->dump);
         // close file
         $zip->close();

         // Check whether file has been created
         if(!file_exists($this->datei))
         {
   die("The ZIP file could not be created.");
         }

         echo "<p><small>The zip was created.</small></p>";
 }

 /**
  * this function create the full sql dump
  * @param object $dump
  * @return
  */
 protected function createDUMP($dump)
 {
         $date = date("F j, Y, g:i a");

         $header = <<<HEADER
-- SQL Dump
--
-- Host: {$_SERVER['HTTP_HOST']}
-- Erstellungszeit: {$date}

--
-- Datenbank: `{$this->config['mysql'][3]}`
--
-- --------------------------------------------------------
HEADER;
  foreach($dump AS $name => $value)
  {
      $sql .= $name.$value;
  }
  $this->dump = $header.$sql;
 }

 /**
  * this function displays the output form to select tables
  * @return
  */
 public function outputForm()
 {
         // select all tables from database
         $result = mysql_list_tables($this->config['mysql'][3]);

         $buffer = '
         <fieldset>
   <legend>Select some tables</legend>
   <form method="post" action="">
         <select name="table[]" multiple="multiple" size="30">';
         while($row = mysql_fetch_row($result))
         {
   $buffer .= '<option value="'.$row[0].'">'.$row[0].'</option>';
         }
         $buffer .= '</select>
         <br /><br />
         <input type="submit" name="backup" value="Backup Tables" />
         </form>
         </fieldset>';

         echo $buffer;
 }
       }
?>

备份用法:
<?php
//添加email地址
$options = array('email' => array('email1', 'email2'),
'folder' => './backup/',
'mysql' => array('localhost', 'root', '****', 'database'));

$b = new Backup($options);
// 点击备份按钮后，开始备份。
if(isset($_POST['backup']))
{
     // start backup
     $b->backupDB();
}
// display tables
$b->outputForm();
?>

<?php
function test(){

static $a=0;
// but if  $a=0;
echo $a++.'<br>';
}

test();
test();
test();
?>