if (!empty($_POST['dbexport'])) {
    $mysqlUserName = "root";
    $mysqlPassword = "";
    $mysqlHostName = "localhost";
    $DbName = "gestioncle";
    $backup_name = "GestionCle.sql";
    $tables = array("Cles", "Portes", "PretEntreprise", "PretPersonnel", "Users");

    Export_Database($mysqlHostName,$mysqlUserName,$mysqlPassword,$DbName,  $tables=false, $backup_name=false );

    function Export_Database($host,$user,$pass,$name,  $tables=false, $backup_name=false )
    {
        $mysqli = new mysqli($host,$user,$pass,$name);
        $mysqli->select_db($name);
        $mysqli->query("SET NAMES 'utf8'");

        $queryTables    = $mysqli->query('SHOW TABLES');
        while($row = $queryTables->fetch_row())
            $target_tables[] = $row[0];
        if($tables !== false)
            $target_tables = array_intersect( $target_tables, $tables);
        foreach($target_tables as $table)
        {
            $result = $mysqli->query('SELECT * FROM '.$table);
            $fields_amount = $result->field_count;
            $rows_num=$mysqli->affected_rows;
            $res = $mysqli->query('SHOW CREATE TABLE '.$table);
            $TableMLine = $res->fetch_row();
            $content = (!isset($content) ?  '' : $content) . "\n\n".$TableMLine[1].";\n\n";

            for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0)
            {
                while($row = $result->fetch_row())
                {
                    if ($st_counter%100 == 0 || $st_counter == 0 )
                        $content .= "\nINSERT INTO ".$table." VALUES";
                    $content .= "\n(";
                    for($j=0; $j<$fields_amount; $j++)
                    {
                        $row[$j] = str_replace("\n","\\n", addslashes($row[$j]) );
                        if (isset($row[$j]))
                            $content .= '"'.$row[$j].'"' ;
                        else
                            $content .= '""';
                        if ($j<($fields_amount-1))
                            $content.= ',';
                    }
                    $content .=")";
                    if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num)
                        $content .= ";";
                    else
                        $content .= ",";
                    $st_counter=$st_counter+1;
                }
            } $content .="\n\n\n";
        }
        $backup_name = $backup_name ? $backup_name : $name.".sql";
        header('Content-Type: application/octet-stream');
        header("Content-Transfer-Encoding: Binary");
        header("Content-disposition: attachment; filename=\"".$backup_name."\"");
        echo $content; exit;
    }
}