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<?php $time = '1535552942'; var_dump(strtotime((int)$time + 10)); var_dump(time()); var_dump(strtotime('+10 seconds', $time));
Output for 7.1.0 - 7.1.21, 7.2.0 - 7.2.9
int(31009790155) int(1535555398) int(1535552952)

preferences:
67.76 ms | 406 KiB | 5 Q