How to convert php time format into timestamp

How to convert PHP time format into timestamp: 1. Use the strtotime function to convert the date represented by the English text string into a timestamp. The syntax is "strtotime (string time [, int now])"; 2. , obtain the timestamp from the date through the mktime function.

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PHP date to timestamp strtotime and mktime functions

The strtotime() function is used to convert the date represented by the English text string into a timestamp. It is the inverse function of date() and returns the timestamp successfully, otherwise it returns FALSE.

Syntax:

int strtotime ( string time [, int now] )

The parameter time is the parsed string, which is the date represented according to the GNU date input format.

Example:

<?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
?>

mktime() function is used to get the timestamp from the date, and returns the timestamp successfully, otherwise it returns FALSE.

Syntax:

int mktime(hour, minute, second, month, day, year)

Example:

<?php
echo mktime(21, 50, 55, 07, 14, 2010);//输出“1279115455”
?>

Parameters can be from right to left If omitted, any omitted parameters will be set to the current values ​​of the local date and time.

mktime() is useful for doing date calculations and validation, it will automatically calculate the correct value for out-of-range input. For example, the following example outputs 2008-01-01:

<?php
echo date("Y-m-d", mktime(0, 0, 0, 12, 32, 2007));
echo date("Y-m-d", mktime(0, 0, 0, 13, 1, 2007));
?>

The last day of the next month:

The last day of any given month can be expressed as the first day of the next month "0" days, not -1 days, as in the following example:

<?php
$lastday = mktime(0, 0, 0, 3, 0, 2008);
echo strftime("2008年最后一天是：%d", $lastday);
?>

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