Unique Reference

[andy295]

Hi,

 

I just need someone to check that a couple of lines I've written do what I believe them to do... i.e. check my logic!

 

I'm developing a booking form for booking on events. Each booking needs a unique reference, which needs to be meaningless to the customer, so I am BASE36 encloding it.

 

As the booking is be saved to a MySql database, my approach is to use the auto-incremented ID for the record to make the reference unique. The increment starts at 10000, and I add a random number before coding to make the encoded reference longer. I then BASE36 encode it to make it appear random.

 

Am I right in thinking the reference produced WILL be unique ... provided the auto-inc ID is unique?

 

$ref = rand(100,999) . $auto_incremented_id; //e.g. 354 & 10012 = 35410001
$ref_encoded = strtoupper(base_convert($rand, 10, 36)); // e.g.UD4J8P

Thanks