PHP short unique ID generation using auto_increment?

Question

I would like to generate a short, unique ID without having to check for collisions.

I currently do something like this, but the ID I currently generate is random and che

Answer 1

you can use a bitwise XOR to scramble some of the bits:

select thefield ^ 377 from thetable;

+-----+---------+
| a   | a ^ 377 |
+-----+---------+
| 154 |     483 |
| 152 |     481 |
|  69 |     316 |
|  35 |     346 |
|  72 |     305 |
| 139 |     498 |
|  96 |     281 |
|  31 |     358 |
|  11 |     370 |
| 127 |     262 |
+-----+---------+