i am stuck in a code, which is working fine but not all the time, it works for 4 transactions after that it shows an undefined offset error, which i can not figure out why it is occurring after running for four times, here is the code
<?php
$Selectlatest=mysqli_query($connection,"Select * from pos_order order by transaction_id desc limit 0,1");
$row_Selectlatest=mysqli_fetch_array($Selectlatest);
if(mysqli_num_rows($Selectlatest)==0){
$num = 001;
$invoice_no = date('dmy').$num;
}
$new = str_split($row_Selectlatest['invoice_no'],6);
$invoice_no= date('dmy').$new[1]+1 ;
?>
it works fine but after 4 consecutive transaction it shows an error which is
Notice: Undefined offset: 1 in C:\xampp\htdocs\Point_of_sale\admin\cart.php on line 60
How to solve it or any other way of generating the invoice or kind of referance no, which increases after checking the previous number from database?
