Simple php script for backup a database and upload to dropbox

dropbox_mysql_backup.php

<?php
/**
 * diegargon http/mail: diego.envigo.net
 * Simple php script for backup a database and upload to dropbox
 *  This script need  Dropbox_Uploader https://github.com/andreafabrizi/Dropbox-Uploader
 *  Warning: zip/password its a bad option if you want protect sensitive data
 */

// Config Start
$tmp_dir = "/tmp/";
$db_user = "";
$db_password = "";
$db_name = "";
$db_host = "localhost";
$date = date('d_m_Y');
$prefix = "db.$db_name.$date";
$dropbox_dest = ""; //Folder
$zip_password = "";
$uploader_path = "dropbox_uploader.sh"; //Path to dropbox_uploader

// End config


$sql_file = $tmp_dir.$prefix.".sql";
$backup_file_tar = $tmp_dir.$prefix.".tar";
$backup_file_zipped = $tmp_dir.$prefix.".tgz";

exec ("mysqldump -h ".$db_host." -u ".$db_user." --password='".$db_password."' ".$db_name." --> ".$sql_file);
exec("tar cvf $backup_file_tar $sql_file 2> /dev/null");
exec("zip -P $zip_password -r $backup_file_zipped $backup_file_tar");
exec("$uploader_path upload  $backup_file_zipped $dropbox_dest/$prefix.tgz");

unlink($sql_file);
unlink($backup_file_zipped);
unlink($backup_file_tar);
echo "Successful uploading the $db_name backup to $dropbox_dest/$prefix.tgz";
exit(0);
?>