What is a timestamp in php?
The timestamp refers to the total number of seconds from 00:00:00 on January 1, 1970, Greenwich Time (08:00:00 on January 1, 1970, Beijing time) to the present Number of seconds. It is also called Unix Timestamp.
PHP About timestamps, the use of time
1. Get timestamp
time(); // 1571299936
2.date(), format a local time/ Date
The time obtained using date() is related to the time zone.
In the following example, Beijing time is obtained:
date('Y-m-d H:i:s', time()); // 2019-10-17 10:12:36
3. gmdate(), format a GMT/UTC date/time
Same as date() Usage: The time returned has nothing to do with the time zone. The time returned is Greenwich Mean Time (GMT).
gmdate('Y-m-d H:i:s', time()); // 2019-10-17 10:12:42
4. strtotime(): Parse the date and time description of any English text into a timestamp.
Used to convert the date represented by the English text string into a timestamp. It is the inverse function of date(). It returns the timestamp successfully, otherwise it returns FALSE.
<?php echo strtotime("2009-10-21 16:00:10"); //输出 1256112010 echo strtotime("10 September 2008"); //输出 1220976000 echo strtotime("+1 day"), "<br />"; //输出明天此时的时间戳 ?>
5. mktime(): Get the timestamp from the date and return the timestamp successfully, otherwise return FALSE.
<?php echo mktime(21, 50, 55, 07, 14, 2010); //输出“1279115455” ?>
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