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run code in 300+ PHP versions simultaneously
<?php $now = (new DateTime())->setTime(0,0,31)->getTimestamp(); $ts = strftime('%Y-%m-%d %H:%M:00', $now); $exists = ['jobname/' . $ts => true ]; $timeAhead = 15 * 60 + $now; $jobName = 'jobname'; for ($time = $now + 30; $time < $timeAhead; $time += 60) { $ts = strftime('%Y-%m-%d %H:%M:00', $time); echo $ts . PHP_EOL; if (!empty($exists[$jobName.'/' . $ts])) { // already scheduled continue; } $exists[$jobName.'/' . $ts] = true; } echo count($exists);

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56.88 ms | 402 KiB | 5 Q