Question

i have following code for loop

for ($i=0; $i<=(count($subusers)-1); ++$i) {

is there a reason to use ++$i instead of $i++ if latter doing same thing?

Answer 1

++$i is a micro-optimisation, it executes fractionally faster than $i++. However, unless the $subusers array is being changed within the loop so that count($subusers) can change from one iteration to the next, then any slight positive gain in speed is being negated (and then some) by counting the number of array entries every iteration.

Note that $i++ and ++$i would both execute at the end of each iteration of the loop. It isn’t the same as initialising $i to 1 rather than to 0.