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run code in 150+ php & hhvm versions
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<?php $target_days = mktime(0,0,0,12,31,2013);// modify the birth day 12/31/2013 $today = time(); $diff_days = ($target_days - $today); $days = (int)($diff_days/86400); print "Days till next birthday: $days days!"; ?>
Output for 4.3.0 - 7.1.0