Php obtains the date code of the previous day or the next day.

Code of the day before and after PHP judgment, or the number of days before and after: Code of the day before/after PHP judgment, or the number of days before and after PHP judgment:

 "; Echo" today: ", date (" Y-m-d ", strtotime (" 18 Jun 2008 ")),"
"; Echo" yesterday: ", date (" Y-m-d ", strtotime ("-1 day ")),"
"; Echo" tomorrow: ", date (" Y-m-d ", strtotime (" + 1 day ")),"
"; Echo" one week later: ", date (" Y-m-d ", strtotime (" + 1 week ")),"
"; Echo" one week, two days, four hours, two seconds later: ", date (" Y-m-d G: H: s ", strtotime ("+ 1 week 2 days 4 hours 2 seconds ")),"
"; Echo" next Thursday: ", date (" Y-m-d ", strtotime (" next Thursday ")),"
"; Echo" last Monday: ". date (" Y-m-d ", strtotime (" last Monday "))."
"; Echo" a month ago: ". date (" Y-m-d ", strtotime (" last month "))."
"; Echo" one month later: ". date (" Y-m-d ", strtotime (" + 1 month "))."
"; Echo" Ten years later: ". date (" Y-m-d ", strtotime (" + 10 year "))."
";?>

Determine the number of days before a date: