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                  php自帶的date轉換的時候如果需要自然月的日子,當遇到日子不同時候可能導致不是預期的結果,以下函數修正了這個問題,   調用方法:echo dateadd('m',1,'2018-01-31',1);//不需要自然月的時候最后一個參數不填,需要的時候,填寫任意值即可。 `function DateAdd($part, $n, $date,$realDay=0) { switch($part) { case "y": $val = date("Y-m-d H:i:s", strtotime($date ." +$n year")); break; case "m": $val = date("Y-m-d H:i:s", strtotime($date ." +$n month")); //如果需要自然月則判斷日子是否相同,不同就執行轉換 if($realDay!=0&&date('d',strtotime($date))!=date('d',strtotime($val))){ $val = date("Y-m", strtotime($date)); $val = date('Y-m-d', strtotime(date("$val-01") . " -1 day +$n+2 month")); $val.= date(' H:i:s', strtotime($date)); } break; case "w": $val = date("Y-m-d H:i:s", strtotime($date ." +$n week")); break; case "d": $val = date("Y-m-d H:i:s", strtotime($date ." +$n day")); break; case "h": $val = date("Y-m-d H:i:s", strtotime($date ." +$n hour")); break; case "n": $val = date("Y-m-d H:i:s", strtotime($date ." +$n minute")); break; case "s": $val = date("Y-m-d H:i:s", strtotime($date ." +$n second")); break; } return $val; }`
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