PHP uses Strtotime to get last month, next month, month date _php tips

Today, when I write the program, suddenly found a long time ago to get the number of days of the function, the classic switch version, but to get the number of days last month, I just put the month-1, I guess it was too sleepy, and then see a kind of creepy feeling, would like to deal with, But I think there are some super convenient way, so I found the following version, made a little change.

Get this month's date:

 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 so, $firstday will be 2014-02-01, and then according to $firstday plus one months is 2014-03-01, minus one day is 2014-02-28, It's really convenient to use date () and Strtotime ().

Get 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);
 

Last month's date needs to get a timestamp, and then on the month-1 is OK, super smart Date () will convert 2014-0-1 this thing to 2013-12-01, it's cool.

Get Next month Date:

 function Getnextmonthdays ($date) {
   $timestamp =strtotime ($date);
   $arr =getdate ($timestamp);
   if ($arr [' mon '] = =
     $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 the next month's date looks a little bit longer because date () is not going to be like 2014-13-01, it will go straight back to 1970, so you need to deal with the December problem, except for the December direct month +1 is OK.

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

Finally, briefly introduce the usage of Strtotime

Gets the UNIX timestamp for the specified date

The Strtotime ("2009-1-22") example is as follows:
Echo strtotime ("2009-1-22")
Results: 1232553600
Note: Return January 22, 2009 0:0 0 seconds time stamp

Get English text date time

Examples are as follows:
Easy to compare, using date to convert the timestamp to the system time with the specified timestamp

(1) Print tomorrow at this time the timestamp strtotime ("+1 Day")
Current time:
echo Date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
echo Date ("Y-m-d h:i:s", Strtotime ("+1 Day")
Results: 2009-01-23 09:40:25

(2) Print the timestamp strtotime ("-1 day") at this time yesterday
Current time:
echo Date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
echo Date ("Y-m-d h:i:s", Strtotime ("-1 day")
Results: 2009-01-21 09:40:25

(3) Print the timestamp strtotime ("+1 Week") at this time next week
Current time:
echo Date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
echo Date ("Y-m-d h:i:s", Strtotime ("+1 Week"))
Results: 2009-01-29 09:40:25

(4) Print the timestamp strtotime ("-1 week") at this time last week
Current time:
echo Date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
echo Date ("Y-m-d h:i:s", Strtotime ("-1 Week"))
Results: 2009-01-15 09:40:25

(5) Print a timestamp strtotime ("next Thursday") that specifies the next day of the week
Current time:
echo Date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
echo Date ("Y-m-d h:i:s", Strtotime ("next Thursday")
Results: 2009-01-29 00:00:00

(6) Print a timestamp strtotime ("last Thursday") that specifies the previous week
Current time:
echo Date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
echo Date ("Y-m-d h:i:s", Strtotime ("last Thursday")
Results: 2009-01-15 00:00:00

The above example shows that Strtotime can resolve the date-time description of any English text to a Unix timestamp, and we combine the mktime () or date () format date time to get the specified timestamp to achieve the required DateTime.