Description:
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1. Run shmop_open with $key=0 and $flags="n" multiple times.
2. Wonder about a missing warning when using the same key for creation.
3. Check the output of ipcs -m. There should show up multiple segments now.

For other integers <> 0 shmop_open works as expected

Test script:
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<?php

$res = shmop_open(0,"n",0600,1024);
$res = shmop_open(0,"n",0600,1024);

?>

Expected result:
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At least a warning should be thrown w/o creating another segment.

Warning: shmop_open(): unable to attach or create shared memory segment in php shell code on line 1

Call Stack:
   10.9282     120780   1. {main}() php shell code:0
   10.9282     120920   2. shmop_open() php shell code:1