can someone take a look at https://bugs.php.net/bug.php?id=73888
real_path_cache as it is implemented now is pretty worthless when each
worker maintains it's own cache and clearstatcache() can not work at all
with that design because the worker which calls clearstatcache() doe sit
for it's own "instance" of the cache and the others don't know anyhting
about it
https://github.com/php/php-src/commit/782b84c6d550ac6e695b54070bb0b409cac29f58
also does more harm than benfits because you waste 4 MB for each worker
process with a still unpredictable and mostly low hitrate
under growing load with a high number of workers the problem grows, low
hitrate and clearstatcache() on a just changed file with no effect for
any of the other worker processes