Fix #81585: cached_chunks are not counted to real_size on shutdown - #7745

header('Content-Type:text/plain');
ini_set('display_errors', 1);

echo sprintf("\nmemory usage: %.3f MB", memory_get_usage(true) / 1024 / 1024);
ini_set('memory_limit', '64M');

ini_set('memory_limit', '1G');
for ($i = 0; $i < 100; ++$i) {
	// create an object which isn't immediately garbage collected by making it reference itself
	$a = new \StdClass();
	$a->a = $a;
	// have it consume memory. Behaviour does not appear to trigger when this string is 2 MB or larger,
	// possibly because it can be more easily be collected when it exceeds ZEND_MM_CHUNK_SIZE?
	$a->b = str_repeat('a', 1024*1024*1);
}
echo sprintf("\nmemory usage: %.3f MB", memory_get_usage(true) / 1024 / 1024);

gc_collect_cycles();
echo sprintf("\nmemory usage: %.3f MB", memory_get_usage(true) / 1024 / 1024);

memory usage: 2.000 MB
memory usage: 200.000 MB
memory usage: 4.000 MB

memory usage: 2.000 MB
memory usage: 198.000 MB
memory usage: 100.000 MB

memory usage: 2.000 MB
memory usage: 100.000 MB
memory usage: 52.000 MB

memory usage: 2.000 MB
memory usage: 50.000 MB
memory usage: 26.000 MB

memory usage: 2.000 MB
memory usage: 14.000 MB
memory usage: 10.000 MB

...

memory usage: 2.000 MB
memory usage: 2.000 MB
memory usage: 2.000 MB

memory usage: 2.000 MB
memory usage: 200.000 MB
memory usage: 4.000 MB

memory usage: 4.000 MB
memory usage: 200.000 MB
memory usage: 102.000 MB

memory usage: 102.000 MB<br />
<b>Warning</b>:  Failed to set memory limit to 67108864 bytes (Current memory usage is 106954752 bytes) in <b>/home/peter/projects/objectenregister/memtest.php</b> on line <b>6</b><br />
memory usage: 200.000 MB
memory usage: 152.000 MB

memory usage: 152.000 MB<br />
<b>Warning</b>:  Failed to set memory limit to 67108864 bytes (Current memory usage is 159383552 bytes) in <b>/home/peter/projects/objectenregister/memtest.php</b> on line <b>6</b><br />
memory usage: 200.000 MB
memory usage: 176.000 MB

...

memory usage: 200.000 MB<br />
<b>Warning</b>:  Failed to set memory limit to 67108864 bytes (Current memory usage is 209715200 bytes) in <b>/home/peter/projects/objectenregister/memtest.php</b> on line <b>6</b><br />
memory usage: 200.000 MB
memory usage: 200.000 MB