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I have checked all $_SERVER member var, still don't know how.

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Reset to default
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if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off')
    // do your stuff here...
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is there some time that it will be != 'off' AND != 'on'?
Yes. IIS with ISAPI. See Mauris' answer.
Ah, my bad. That comment was actually the right answer, but not to your question, @quack. I don't know of any other case. However, as Mauris' wrote, IIS sets the value to 'off' when using ISAPI which is why the second part of the condition is necessary.
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$_SERVER['HTTPS'] - from http://php.net/manual/en/reserved.variables.server.php

Set to a non-empty value if the script was queried through the HTTPS protocol.

Note: Note that when using ISAPI with IIS, the value will be off if the request was not made through the HTTPS protocol.

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$_SERVER['HTTPS'] == 'on'

upd: and $_SERVER['SERVER_PROTOCOL'] or $_SERVER['SERVER_PORT'] == 443//80 for http

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if you do print_r($_SERVER); => you can see this. [HTTPS] => on

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I don't have this var in my $_SERVER, why ?

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