Usage of strtotime() function in php_PHP tutorial

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1. Get the unix timestamp of the specified date
The example of strtotime("2009-1-22") is as follows:
1.echo strtotime("2009-1-22")

Result: 1232553600
Description: Returns the timestamp of 0:00:00 on January 22, 2009
2. Get the English text date and time
An example is 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:
1.echo date("Y-m-d H:i:s",time())

Result: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date("Y-m-d H:i:s",time())

Result: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date("Y-m-d H:i:s",time())

Result: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date("Y-m-d H:i:s",time())

Result: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date("Y-m-d H:i:s",time())

Result: 2009-01-22 09:40:25
Specified time:
1.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:
1.echo date("Y-m-d H:i:s",time())

Result: 2009-01-22 09:40:25
Specified time:
1.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 use mktime() or date() to format the date and time to obtain the specified timestamp and achieve the required date and time.