break yg bikin mumet

<?php
$aksi=isset($_GET['aksi']) ? $_GET['aksi'] : "";
switch($aksi){
default:
    $waktu=date("DdMY");
    echo"<div class='content_block'><div class='box_bg'><h2>Backup Database</div></div><div class='content_block'><div class='box_bg'>";
    if(!isset($_GET['tabel']))$tables='semua';
    else $tables=$_GET['tabel'];
        if($tables == 'semua'){
            $tables = array();
            $result = mysql_query('SHOW TABLES');
            while($row = mysql_fetch_row($result)){
            $tables[] = $row[0];
            $return.= 'DROP TABLE IF EXIST IF EXIST '.$table.';';}
        }else{
            //jika hanya table-table tertentu
            $tables = is_array($tables) ? $tables : explode(',',$tables);
        }
        //looping dulu ah
            $return="";
            foreach($tables as $table){
            $result = mysql_query('SELECT * FROM '.$table);
            $num_fields = mysql_num_fields($result);
            //menyisipkan query DROP TABLE IF EXIST untuk nanti hapus table yang lama
            $return.= 'DROP TABLE IF EXIST '.$table.';';
            $row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
            $return.= "".$row2[1].";";
            for ($i = 0; $i < $num_fields; $i++){
                while($row = mysql_fetch_row($result)){
/*
menyisipkan query Insert. untuk nanti memasukan data yang lama ketable yang baru dibuat. so toy mode : ON
*/
                    $return.= 'INSERT INTO '.$table.' VALUES(';
                    for($j=0; $j<$num_fields; $j++){
                    //akan menelusuri setiap baris query didalam
                        $row[$j] = $row[$j];
                        if (isset($row[$j])) {
                            $return.= '"'.addslashes($row[$j]).'"' ;
                        }
                        else {
                            $return.= '""';
                        }
                        if ($j<($num_fields-1)) {
                            $return.= ',';
                        }
                    }
                    $return.= ");\n";
                }
            }
                $return.="\n\n";
        }
    $tabel=array("ppdb_admin", "ppdb_pendaftar", "ppdb_info","ppdb_kontak","ppdb_menu","ppdb_submenu","ppdb_siswa","ppdb_clnsiswa","ppdb_prestasi","ppdb_nilai");
    echo"<form  name='form-backup' method='post' action='?module=backup&aksi=backup'>
    Pilih tabel <select name='tabel' onChange=\"window.location.href='?module=backup&tabel='+this.value;\">
        <option value='semua'>semua tabel</option>";
        $table=isset($_GET['tabel']) ? $_GET['tabel'] : "semua";
        foreach($tabel as $tbl){
            echo"<option value='$tbl'";
            if($tbl==$table) echo" selected";
            echo">$tbl</option>";
        }
    echo "</select>
    <textarea name='isitabel' style='width: 100%;' cols=83 rows=25>".htmlentities($return)."</textarea><br>
    <input type=submit class='tombol' value='Backup'></form>";
    echo"</div></div>";
break;
case "backup":
    $nama_file=date("DdMY").'_backup_data_'.time().'.sql';
    $return=$_POST['isitabel'];
        $nama_file;
        $handle = fopen('backup/'.$nama_file,'w+');
        fwrite($handle, stripslashes($return) );
        fclose($handle);
    echo "Database berhasil dibackup, untuk mendownload file backup klik tombol berikut!<br><br>
        <a class='tombol' href='modul/mod_br/backup/backup.php?aksi=download&file=$nama_file'>Download File Backup</a>";
break;
case "download":
    $folder="../../../backup/";
    $file=$_GET['file'];
    header("Content-Disposition: attachment; filename=$folder".$file);
    header("Content-type: $folder".$file);
    readfile("$folder".$file);
    unlink("$folder$file");
    exit;
break;
}
?>