How to generate unique random value for each user in laravel and add it to database

Question

I am developing a event organization website. Here when the user registers for an event he will be given a unique random number(10 digit), which we use to generate a barcode

Answer 1

Looping through the array won't be that efficient. If your database becomes too large then it slow down the entire process and also there might be a rare situation when 2 threads are looping through the array for the same random number and it will be found available and return same number to both the tickets.

So instead of looping through the array you can set the 10 digit registration id as primary key and instead of looping through the array you can insert the registration details along with randomly generated number, if the database insert operation is successful you can return the registration id but if not then regenerate the random number and insert.

Alternate solution which will be more effective Instead of 10 digit random numbers you can use timestamp to generate a 10 digit unique registration number and to make it random you can randomize the first 2 or 3 digits of the timestamp