In the following code the line with for statement is marked with Suspicious loop inspection
<?php
for ($i = 1; $i <= 10; $i *= 2) {}
If the iteration expression is changed to $i++ the inspection goes away.
I probably am missing something, but I don't see how $i *= 2 is more "suspicious" than $i++.
Thank you for reporting @zerkms. That's false-positive, I'll take care of it.
Fixed