function autoBakTablesBags() {
 	set_time_limit(0);
     $tables=$this->getTables();
     $tables = array_col_values($tables,'name');
     $bagsize=1;
     $file=date('Y-m-d-H-i-').substr(base64_encode(md5(time().rand(0,10000000000000))),0,6);
     $_path=ROOT."/data/$file/sql-".$file;
     tool::mkdir(dirname($_path.'.ext'));
     $tabledump='';
     if (is_array($tables))
         foreach ($tables as $table) {
             $tabledump .= "DROP TABLE IF EXISTS $table;\n";
             $create=mysql_fetch_row($this->query("SHOW CREATE TABLE `$table` "));
             $create_str=$create[1];
             if (front::post('mysql4'))
                 $create_str=preg_replace('/ENGINE=.+?$/','',$create_str);
             $tabledump .= $create_str.";\n";
         }
     $bag=1;
     if (is_array($tables))
         foreach ($tables as $table) {
             $rows=$this->query("SELECT * FROM $table ");
             $numfields=mysql_num_fields($rows);
             $numrows=mysql_num_rows($rows);
             while ($row=mysql_fetch_row($rows)) {
                 $comma="";
                 $tabledump .= "INSERT INTO $table VALUES(";
                 for ($i=0;$i <$numfields;$i++) {
                     $tabledump .= $comma."'".mysql_escape_string($row[$i])."'";
                     $comma=",";
                 }
                 $tabledump .= ");\n";
                 if (strlen($tabledump) >$bagsize * 1024 * 1024) {
                     file_put_contents($_path.'-'.$bag.'.sql',$tabledump);
                     $bag++;
                     $tabledump='';
                 }
             }
             $tabledump .= "\n";
         }
     if ($tabledump)
         file_put_contents($_path.'-'.$bag.'.sql',$tabledump);
 }
function array_col_values_unique($arr, $col)
{
    return array_unique(array_col_values($arr, $col));
}