Description:
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From manual page: http://www.php.net/function.shm-attach#Description
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Default values for parameter $memsize and $perm are missing in the prototype but are mentioned in the english description.

$memsize=ini_get("sysvshm.init_mem")
$perm=0666

So prototype should be :

resource shm_attach ( int $key [, int $memsize = ini_get("sysvshm.init_mem") [, int $perm = 0666]] )


Expected result:
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resource shm_attach ( int $key [, int $memsize = ini_get("sysvshm.init_mem") [, int $perm = 0666]] )


Actual result:
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resource shm_attach ( int $key [, int $memsize [, int $perm ]] )