tweaking some comments.
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@ -274,10 +274,10 @@ public static function close()
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static::$transporter->put(static::$session['id'], $config);
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// Some session drivers may implement the Sweeper interface, meaning the
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// driver must do its garbage collection manually. Alternatively, some
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// drivers such as APC and Memcached are not required to manually
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// clean up their sessions.
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// Some session drivers clean-up expired sessions manually; however, since
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// this can be an expensive process, it is only performed once in a while.
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// The probability of session garbage collection occuring for any given
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// request is controlled by the "sweepage" configuration option.
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$sweep = (mt_rand(1, $config['sweepage'][1]) <= $config['sweepage'][0]);
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if ($sweep and static::$driver instanceof Drivers\Sweeper)
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