Add 30 seconds to the time with PHP -

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How can I add 30 seconds at this time? 

  $ time = date ("m / d / y h: i: s", time ());

I was not sure how to do this because it is showing many units of time, when I want to add only 30 seconds. 

  $ time = date ("m / d / yh: i: sa", time () + 30);

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