PHP code to backup mysql data

#####################
//CONFIGURATIONS
#####################
// Define the name of the backup directory
define('BACKUP_DIR', './myBackups' ) ;
// Define  Database Credentials
define('HOST', 'localhost' ) ;
define('USER', 'testd!b' ) ;
define('PASSWORD', 'k^$2y4n9@#VV' ) ;
define('DB_NAME', 'test123' ) ;
/*
Define the filename for the sql file
If you plan to upload the  file to Amazon's S3 service , use only lower-case letters
*/
$fileName = 'mysqlbackup--' . date('d-m-Y') . '@'.date('h.i.s').'.sql' ;
// Set execution time limit
if(function_exists('max_execution_time')) {
if( ini_get('max_execution_time') > 0 )     set_time_limit(0) ;
}

###########################

//END  OF  CONFIGURATIONS

###########################

// Check if directory is already created and has the proper permissions
if (!file_exists(BACKUP_DIR)) mkdir(BACKUP_DIR , 0700) ;
if (!is_writable(BACKUP_DIR)) chmod(BACKUP_DIR , 0700) ;

// Create an ".htaccess" file , it will restrict direct accss to the backup-directory .
$content = 'deny from all' ;
$file = new SplFileObject(BACKUP_DIR . '/.htaccess', "w") ;
$file->fwrite($content) ;

$mysqli = new mysqli(HOST , USER , PASSWORD , DB_NAME) ;
if (mysqli_connect_errno())
{
   printf("Connect failed: %s", mysqli_connect_error());
   exit();
}
 // Introduction information
 $return .= "--n";
$return .= "-- A Mysql Backup System n";
$return .= "--n";
$return .= '-- Export created: ' . date("Y/m/d") . ' on ' . date("h:i") . "nnn";
$return = "--n";
$return .= "-- Database : " . DB_NAME . "n";
$return .= "--n";
$return .= "-- --------------------------------------------------n";
$return .= "-- ---------------------------------------------------n";
$return .= 'SET AUTOCOMMIT = 0 ;' ."n" ;
$return .= 'SET FOREIGN_KEY_CHECKS=0 ;' ."n" ;
$tables = array() ;
// Exploring what tables this database has
$result = $mysqli->query('SHOW TABLES' ) ;
// Cycle through "$result" and put content into an array
while ($row = $result->fetch_row())
{
$tables[] = $row[0] ;
}
// Cycle through each  table
 foreach($tables as $table)
 {
// Get content of each table
$result = $mysqli->query('SELECT * FROM '. $table) ;
// Get number of fields (columns) of each table
$num_fields = $mysqli->field_count  ;
// Add table information
$return .= "--n" ;
$return .= '-- Tabel structure for table `' . $table . '`' . "n" ;
$return .= "--n" ;
$return.= 'DROP TABLE  IF EXISTS `'.$table.'`;' . "n" ;
// Get the table-shema
$shema = $mysqli->query('SHOW CREATE TABLE '.$table) ;
// Extract table shema
$tableshema = $shema->fetch_row() ;
// Append table-shema into code
$return.= $tableshema[1].";" . "nn" ;
// Cycle through each table-row
while($rowdata = $result->fetch_row())
{
// Prepare code that will insert data into table
$return .= 'INSERT INTO `'.$table .'`  VALUES ( '  ;
// Extract data of each row
for($i=0; $i<$num_fields; $i++)
{
$return .= '"'.$rowdata[$i] . ""," ;
 }
 // Let's remove the last comma
 $return = substr("$return", 0, -1) ;
 $return .= ");" ."n" ;
 }
 $return .= "nn" ;
}
// Close the connection
$mysqli->close() ;
$return .= 'SET FOREIGN_KEY_CHECKS = 1 ; '  . "n" ;
$return .= 'COMMIT ; '  . "n" ;
$return .= 'SET AUTOCOMMIT = 1 ; ' . "n"  ;
//$file = file_put_contents($fileName , $return) ;
$zip = new ZipArchive() ;
$resOpen = $zip->open(BACKUP_DIR . '/' .$fileName.".zip" , ZIPARCHIVE::CREATE) ;
if( $resOpen ){
$zip->addFromString( $fileName , "$return" ) ;
    }
$zip->close() ;
$fileSize = get_file_size_unit(filesize(BACKUP_DIR . "/". $fileName . '.zip')) ;
$message = <<  BACKUP  completed ,
  the archive has the name of  :   $fileName   and it's file-size is :   $fileSize  .
 This zip archive can't be accessed via a web browser , as it's stored into a protected directory .
  It's highly recomended to transfer this backup to another filesystem , use your favorite FTP client to download the archieve .
msg;
echo $message ;

// Function to append proper Unit after file-size .
function get_file_size_unit($file_size){
switch (true) {
    case ($file_size/1024 < 1) :
        return intval($file_size ) ." Bytes" ;
        break;
    case ($file_size/1024 >= 1 && $file_size/(1024*1024) < 1)  :
        return intval($file_size/1024) ." KB" ;
        break;
    default:
    return intval($file_size/(1024*1024)) ." MB" ;
}
}

mysql, php