So if you start from your first invoice its number should be 0000000001, then next invoice should be 0000000002, and so on. To recap, we have two sections that make up an invoice number: The Prefix; A numeric value; This approach is customisable as a user can change the prefix to match their business needs and start the sequential value at any number ie 001, 0001 or 1, max ten characters. autoincrement number starting from 0 when the dropdown change. I want to generate numbers from 0 to so on. Hi guys, ... Maybe you can use the time instead of date and thea actual invoice number, such as if its your first order it … previously it has to check whether already invoice number is or not. PHP. Save it in a db maybe. The increment does a normal string increment, as it cannot convert the string into a number. Can anyone please show me how to generate a unique invoice number in php and how to set it up in mysql? I think the best way would be to have an invoice number : INV20000001, and then increment that. I am trying to generate invoice number in orders table, like if user select 1 or multiple products and add it to cart then place order then invoice number should be same in our orders table for that 1 order in multiple rows according to products. August 30, 2014, 3:49am #1. UNIQUE KEY `invoice_number` (`invoice_number`) Or if you're using phpMyAdmin, select "auto_increment" in the "extra" selection, and choose "unique". Feb 20 '08 # 3 0 0. I was using function mt_rand(); but it generates randomly. if it is there each time after submitting it has to increase by one, else it has to set one number by default. For example in Bulgaria the invoice numbers should be 10 digits long. D:\xampp\htdocs\php-invoice-system │ database.sql │ database_connection.php │ invoice.php │ pdf.php │ print_invoice.php │ ├─css │ │ bootstrap.min.css │ │ dataTables.bootstrap.min.css │ └ datepicker.css │ ├─dompdf <- Outer download │ └ unzip all folders and files │ When the user clicks on the submit button it will take them to a confirmation page where the automatically generated Invoice Number will display. I want to generate an invoice number that goes up … The add expressions convert the strings into longs, by checking if a number is present. LucidSurf. ... Resetting Auto Increment from PHP 3 ; php 9 ; Date formate convert from one to another 6 ; e.g. Since there isn’t, it will convert the string to int(0) and simply add int(1) to it. Thanks guys for ur help… I think u dont understand my q… its simple, For example i want to store this in db:(0107001) here 01 is month,07 is date,001 is number(but it increments on each insertion How to do? 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