PHP uses strtotime to get the dates of last month, next month, and this month, strtotime last month_PHP tutorial

PHP uses strtotime to get the dates of last month, next month, and this month. strtotime last month

When I was writing a program today, I suddenly discovered that I wrote it a long time ago The function to get the number of days in the month, the classic switch version, but when I got the number of days in the previous month, I just changed the month to -1. I guess I was too sleepy at the time. It gave me a creepy feeling when I saw it again. I originally wanted to deal with it again. , but I thought there must be some super convenient method, so I found the following version and made a small modification.

Get the date of this month:

 function getMonth($date){
   $firstday = date("Y-m-01",strtotime($date));
   $lastday = date("Y-m-d",strtotime("$firstday +1 month -1 day"));
   return array($firstday,$lastday);
 }

$firstday is the first day of the month. If $date is 2014-2, $firstday will be 2014-02-01. Then add one month to $firstday to get 2014-03-01, and then subtract one day. It is 2014-02-28. It is so convenient to use date() and strtotime().

Get the date of last month:

 function getlastMonthDays($date){
   $timestamp=strtotime($date);
   $firstday=date('Y-m-01',strtotime(date('Y',$timestamp).'-'.(date('m',$timestamp)-1).'-01'));
   $lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));
   return array($firstday,$lastday);
 }

You need to get a timestamp for the last month’s date, and then add -1 to the month. The super smart date() will convert things like 2014-0-1 into 2013-12-01. It’s so cool. .

Get next month’s date:

 function getNextMonthDays($date){
   $timestamp=strtotime($date);
   $arr=getdate($timestamp);
   if($arr['mon'] == 12){
     $year=$arr['year'] +1;
     $month=$arr['mon'] -11;
     $firstday=$year.'-0'.$month.'-01';
     $lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));
   }else{
     $firstday=date('Y-m-01',strtotime(date('Y',$timestamp).'-'.(date('m',$timestamp)+1).'-01'));
     $lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));
   }
   return array($firstday,$lastday);
 }

The code for next month’s date seems a little longer, because date() cannot convert things like 2014-13-01, it will go back directly to 1970, so we need to deal with the issue of December in the front, except for December Just the 1st of the month is OK.

Generally speaking, it is very convenient. The date function is too powerful.

Finally, let’s briefly introduce the usage of strtotime

Get the unix timestamp of a specified date

strtotime("2009-1-22") Example is as follows:
echo strtotime("2009-1-22")
Result: 1232553600
Description: Returns the timestamp of 0:00:00 on January 22, 2009

Get English text date and time

Examples are as follows:
For easy comparison, use date to convert the current timestamp and the specified timestamp into system time

(1) Print the timestamp at this time tomorrow strtotime(" 1 day")
Current time:
echo date("Y-m-d H:i:s",time())
Result: 2009-01-22 09:40:25
Specified time:
echo date("Y-m-d H:i:s",strtotime(" 1 day"))
Result: 2009-01-23 09:40:25

(2) Print the timestamp of yesterday at this time strtotime("-1 day")
Current time:
echo date("Y-m-d H:i:s",time())
Result: 2009-01-22 09:40:25
Specified time:
echo date("Y-m-d H:i:s",strtotime("-1 day"))
Result: 2009-01-21 09:40:25

(3) Print the timestamp at this time next week strtotime(" 1 week")
Current time:
echo date("Y-m-d H:i:s",time())
Result: 2009-01-22 09:40:25
Specified time:
echo date("Y-m-d H:i:s",strtotime(" 1 week"))
Result: 2009-01-29 09:40:25

(4) Print the timestamp at this time last week strtotime("-1 week")
Current time:
echo date("Y-m-d H:i:s",time())
Result: 2009-01-22 09:40:25
Specified time:
echo date("Y-m-d H:i:s",strtotime("-1 week"))
Result: 2009-01-15 09:40:25

(5) Print the timestamp of the specified day of the week strtotime("next Thursday")
Current time:
echo date("Y-m-d H:i:s",time())
Result: 2009-01-22 09:40:25
Specified time:
echo date("Y-m-d H:i:s",strtotime("next Thursday"))
Result: 2009-01-29 00:00:00

(6) Print the timestamp of the specified day of the week strtotime("last Thursday")
Current time:
echo date("Y-m-d H:i:s",time())
Result: 2009-01-22 09:40:25
Specified time:
echo date("Y-m-d H:i:s",strtotime("last Thursday"))
Result: 2009-01-15 00:00:00

As can be seen from the above example, strtotime can parse the date and time description of any English text into a Unix timestamp. We combine mktime() or date() to format the date and time to obtain the specified timestamp to achieve the required date and time.

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