[tHE DSS]

Ummm... if I am on the right tracks of what you are saying, then, the same amount of queries will be executed no matter where it gets executed from, as long as the code is pretty much the same (no extra queries added).

Perhaps the main consideration would be where to place the code, for better PHP interpretation (not really a biggie though).

Placing the function inside a script that's called into pretty much every script, will cause the interpreter to have to skip the function code for every script that is exectuted (until called)... whereas, if you place the code inside the index.php for example, then the interpreter deals with it only in that script.