backup .sql file is empty
include ("functions_cp/f_connection.php");

        Sqlconnection() ;



    $dbname = "Reservebox";
    $dbhost = "localhost";
    $dbuser = "root";
    $dbpass = "123";



$backupFile =  $dbname . date("Y-m-d-H-i-s") . '.sql';

$command = 'mysqldump -h' .  $dbhost . ' -u ' . $dbuser . '-p =' . $dbpass . ' '. $dbname . ' > ' . $backupFile ;
system($command);

$command = 'mysqldump -h' .  $dbhost . ' -u ' . $dbuser . ' -p' . $dbpass . ' '. $dbname . ' > ' . $backupFile ;