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<?php $times = ["1:10:12", "2:15:33", "3:12:10"]; $today = strtotime(date("Y-m-d")); $intervals = array_map(function($a) use ($today){ return strtotime($a) - $today;}, $times); echo array_sum($intervals)." Seconds";

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38.88 ms | 402 KiB | 5 Q