calculate the difference between 2 timestamps in php : <p>I am using 2 timestamp in my table which is 
starttime datatype- timestamp and as current timestamp.
endtime datatype-timestamp and default as 0000-00-00 00:00:00</p>

<p>how to calculate the difference between 2 timestamps in php
starttime:2016-11-30 03:55:06
endtimetime: 2016-11-30 11:55:06</p>
