[Solved] Add +1 or more day to DATETIME in php eaven if that day is in a different month [closed]

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$date = "2017-12-31";

echo date("Y-m-d", strtotime($date . " +5 days"));

Strtotime() can translate some sentences to actions. See example 1

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solved Add +1 or more day to DATETIME in php eaven if that day is in a different month [closed]