strtotime---用于接收兩個參數，第一個參數是格式化的日期數據如：date('Y-m-d'),第二個參數有如'+7 day'

• 函數版

<?php $firstsunday = strtotime(date('Y-m-01')); $thisy = intval(date('m')); $diffdays=0; $count = 0; if (date('w',strtotime(date('Y-m-01')))!=0) {$diffdays=7-date('w',strtotime(date('Y-m-01'))); } else{$count++; } $startdate =strtotime(date('Y-m-01')."+".$diffdays."day"); while (True) {if ($thisy!=intval(date('m',$startdate))){break;}echo date('Y-m-d',$startdate)."\n";$startdate = strtotime(date('Y-m-d',strtotime(date('Y-m-d',$startdate)."+7 day")));// }

結果

2019-09-01 2019-09-08 2019-09-15 2019-09-22 2019-09-29

• ?類版本---date()的參數可以是‘2019-09-20’這樣的字符串,如同date('2019-09-20')或者是strtotime返回的整型數如同date('Y-m-d',strtotime('2019-09-20))

class mycalendar {function __construct($year,$mon){$this->nianyue=$year.'-'.$mon.'-'.'01';$this->firstday=strtotime(date($this->nianyue));$this->m = intval(date('m',$this->firstday));$this->wdaylist=array();echo "時間戳:".date('Y-m-d',$this->firstday)."\n";}function startday(){$w = date('w',$this->firstday);$diffdays=0;if ($w!=0){$diffdays= 7-$w;}$this->firstday = strtotime(date('Y-m-d',strtotime($this->nianyue))."+".$diffdays." day");//array_push($this->wdaylist,$w);//echo "\n".date('Y-m-d',$this->firstday);//echo "\n".$this->firstday;return $this->firstday;}function addwday(){$curday = $this->startday();while (true){if(intval(date('m',$curday)!=$this->m)){break;}echo date('Y-m-d',$curday)."\n";array_push($this->wdaylist,date('Y-m-d',$curday));$curday=strtotime(date('Y-m-d',$curday)."+7 day");}return $this->wdaylist;} } $mycal = new mycalendar(2019,10); var_dump($mycal->addwday());

?

結果：

時間戳:2019-10-01
2019-10-06
2019-10-13
2019-10-20
2019-10-27
array(4) {
? [0]=>
? string(10) "2019-10-06"
? [1]=>
? string(10) "2019-10-13"
? [2]=>
? string(10) "2019-10-20"
? [3]=>
? string(10) "2019-10-27"
}

• ?計算月末最后一天

echo date('Y-m-d',strtotime(date('2019-10-01')."+1 month -1 day"));

輸出結果：

2019-10-31

• ?注意！對于日期計算一定要，正確的使用參數，否則將會出錯

$lastday = strtotime(date('Y-m-d',$this->time)."+1 day");#正確 $lastday = strtotime(date($this->time)."+1 day");#錯誤，這樣會返回1970-01-01

?

轉載于:https://www.cnblogs.com/saintdingspage/p/11561246.html

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