What is the function to convert time to timestamp in php

Function to convert time to timestamp: 1. mktime(), which can obtain the timestamp from the date and return a Unix timestamp. The syntax is "mktime(hour, minute, second, month, day, year);" ; 2. strtotime(), which can parse the time description of any English text into a timestamp, with the syntax "strtotime (time)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

1. mktime() function

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

Syntax:

mktime(hour,minute,second,month,day,year,is_dst);

##Optional. Specified year. Optional. Set to 1 if the time is during daylight saving time, 0 otherwise, or -1 (default) if unknown. If unknown, PHP will try to find it itself (possibly producing unexpected results).

Parameters	Description
hour	Optional. Specified hours.
minute	Optional. prescribed points.
second	Optional. Specifies seconds.
month	Optional. Specified month.
day	Optional. Specify days.
year
is_dst	Note: This parameter is deprecated in PHP 5.1.0. Instead, new time zone handling features are used.

Return value: Returns an integer Unix timestamp, or FALSE if error occurs.

Example:

<?php
echo mktime(20, 20, 20, 07, 08, 2021);
?>

Output:

1625055620

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

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));
?>

2, strtotime()

strtotime() function is used to represent English text strings Convert date to timestamp, which is the inverse function of date(). It returns timestamp successfully, otherwise it returns FALSE.

Syntax:

strtotime ( time [, now = time() ] )

ParametersDescriptionRequired. Specifies a date/time string. Optional. Specifies the timestamp used to calculate the return value. If this parameter is omitted, the current time is used.

time
now

#Return value: Returns the timestamp on success, and FALSE on failure.

Example:

<?php
echo strtotime("2021-10-21 16:00:10")."<br>";

echo strtotime("10 September 2021")."<br>";

echo strtotime("+1 day");//输出明天此时的时间戳
?>

Output:

1634803210
1631203200
1625803632

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