function AlphaNumeric($length)
		  {
			  $chars = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!@#$%^&*()_";
			  $clen   = strlen( $chars )-1;
			  $id  = '';

			  for ($i = 0; $i < $length; $i++) {
					  $id .= $chars[mt_rand(0,$clen)];
			  }
			  return ($id);
		  }

	for($i=0; $i<10; $i++)
	{
		$cod = AlphaNumeric(10);

		$sql1[$i] = "INSERT INTO wm_voucere (id, cod) VALUES (NULL, '$cod')";
		$result1[$i] = mysqli_query($connection, $sql1[$i]);

	}