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@ 2017-07-03T10:36:23Z

<?php
$interval = (new DateTime('yesterday'))->getTimestamp() - time();

        echo  round( $interval / (60 * 60) );

Output
Performance
VLD
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time: documentation ( source)
round: documentation ( source)

preferences:dark modelive preview

31.53 ms | 402 KiB | 5 Q