note 8916 added to sleep

From: Date: Fri, 06 Oct 2000 00:48:18 +0000
Subject: note 8916 added to sleep
Groups: php.notes 
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Would someone care to clear up whether a sleep(1) is 1000ms or until the top or start of the next whole second, which could be much less than a full second of time ? http://www.php.net/manual/function.sleep.php

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