TG wrote:
Is the most important thing to be random or to be unique? If you need unique, you can use a timestamp including microseconds. Maybe using something like microtime():

The only other way you're probably going to guarentee that you don't repeat numbers is to keep a list of what's been used and compare against it. Otherwise, there's always going to be a slim chance you'll repeat a number.

What do you plan on using it for? Maybe someone can give a better recommendation for what you need. And will this number be generated by PHP or the database? Or can it be either?

There's also - you could even use a different prefix for each call.

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