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I write this simple line to get random & unique code each time (just 8 characters):
echo substr(md5(uniqid(rand(), true)),0,8);
Output:
077331e5
5af425b1
0fc7dcf2
…
I ask if I’ll never get a collision (duplicate). Or that can happen.
BS:
It’s better to use time()?
echo substr(md5(uniqid(time(), true)),0,8);
Hashes can have collisions. By taking a substring of the hash you are just upping the chance of that happening.