What is timestamp in php?

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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