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Date: Thu, 27 Jul 2017 19:03:23 +0200
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Subject: session_start() should not reset $_SESSIOn if it's not empty
From: lists@rhsoft.net ("lists@rhsoft.net")

currently i try to optimize our system so that the landing-page if it 
does not contain forms and when no user is logged in could be cached 
with APCu which works fine so far

there is still a early session_start(); and while delay that would be 
probably possible like it's happening currently with database connection 
on-demand

but there are some important things written in $_SESSION which i can't 
delay and the sample below shows that they would get lost in case it's 
not a cache hit
___________________________________

<?php declare(strict_types=1);
if(!empty($_SESSION['test']))
{
  echo $_SESSION['test'];
}
$_SESSION['test'] = 'test';
session_start();
___________________________________

if that could work in the way that session_start() keeps the current 
state of $_SESSION if not empty it would be possible to put the 
APCU-Read and if exit($apcu_content); before session_start() which would 
gain another 30% performance