Insert Unique Random String Into Database

[The Little Guy]

What would be the best way in insert a random string into the database, but the string cannot already exist in the database (the string will be case sensitive)?

 

I was just going to make a loop that will make a query more than one time if the string is already in the database, but is there a better way to do this?

[DarkWater]

What would be the best way in insert a random string into the database, but the string cannot already exist in the database?

 

I was just going to make a loop that will make a query more than one time if the string is already in the database, but is there a better way to do this?

 

Set the field as unique in the database, and use this to make a unique code.

$code = md5(uniqid(rand(), true));

 

You can take a substr() of that to get the right # of chars if you want.

[The Little Guy]

thank you!

 

Is there a way I can make some of the letters uppercase and some lowercase?