Generate unique reference number php

Why do you need a unique ID? If you want to generate a unique ID in your DB, then leave it to your DB, using auto-increment. Anyway, you could use a combination of microtime() and rand(). You be pretty unique. Edit, relative to OP's comment: You can't have a "always unique" if. Or if you find how, you'll win a turing award. Examples on How to Make a Random Unique User ID Using PHP. A unique user ID can be created in PHP using the uniqid () function. This function has two parameters you can set. The first is the prefix, which is what will be appended to the beginning of each ID. The second is more_entropy. If this is false or not specified, it will return 13 characters; if it's true, 23 characters will be returned. generate a reference number - PHP Development. i would like to generate a sequential number. basically i have a form and on that form is a textfield for a reference number. i would like that number generated. ideally i would like it to be in the format of 'A' 'A' and so on, or 'X', 'X' and so on. all sequential, nothing random.

Generate unique reference number php

Increasingly as you go further down the string, the number becomes "more unique" over time, with the exception of digit 9, where numeral prevalence is >4>f, because of the difference between 10^6 and 16^5 (this is presumably true for the remaining digits as well but much less noticeable). Examples on How to Make a Random Unique User ID Using PHP. A unique user ID can be created in PHP using the uniqid () function. This function has two parameters you can set. The first is the prefix, which is what will be appended to the beginning of each ID. The second is more_entropy. If this is false or not specified, it will return 13 characters; if it's true, 23 characters will be returned. First time through loop: Generate a random number between , through , and call that x1. Second time through the loop Generate a random number between , and x1 call this xt2, then generate a random number between x1 and , call this xt3, then randomly choose x2 .

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