How to use Strtotime function in PHP _php tips

In PHP, there is a function called Strtotime. Strtotime implementation: Gets the timestamp of a date, or gets a timestamp of a time. strtotime resolves a date-time description of any English text to a UNIX timestamp [converts system time to UNIX timestamp]

First, get the UNIX timestamp for the specified date

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

Second, 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:
1.echo date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date ("Y-m-d h:i:s", Time ())
Results: 2009-01-22 09:40:25
Specified time:
1.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.
Hopefully, after the introduction of this article, you have mastered the Strtotime function usage.