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<?php function intervalToSecs(DateInterval $interval): int { $secs = $interval->s; $secs += ($interval->i * 60); $secs += ($interval->h * 60 * 60); if ($interval->days) { $secs += ($interval->days * 60 * 60 * 24); } else { $secs += ($interval->d * 60 * 60 * 24); } return $secs; } $twoDaysTwelveHours = new DateInterval("P2DT12H"); $sixtyHours = new DateInterval("PT60H"); var_dump(intervalToSecs($twoDaysTwelveHours)); var_dump(intervalToSecs($sixtyHours)); var_dump($twoDaysTwelveHours); var_dump($sixtyHours);

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