I am currently working on a mySQL site administration system and I need help
on figuring out how I can create a 24 digit letter/number unique identifier
string. I know that I can easily get a random number using a PHP function (I
can remember it off the top of my head) but I also need to create random
letters and then insert them into the number. Here are the steps of the

1. Create a 12 digit random number using a PHP function
2. Create 12 random letters
3. Insert the letters into the number, or the other way around
Result: 1h5l79G05OP65kN61LPs1o6Z

Out of the steps above, I am not sure how to do 2 and 3 and I would greatly
appreciate it if someone could point out for me how to do them.

Thanks in advance.

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