PHP strtotime +1month 不满31天跨月问题

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//输出:2021-07-01
date('Y-m-d', strtotime('2021-05-31'. 'first day of +1 month'));
//输出:2021-06-01
date('Y-m-d', strtotime('2021-05-31'. 'last day of +1 month'));
//输出:2021-06-30