How to convert time format to timestamp in php?

How to convert PHP time format to timestamp: 1. Use mktime() to convert time to timestamp, syntax "mktime(hour, minute, second, month, day, year)"; 2. Use strtotime() converts a date represented by a string into a timestamp, using the syntax "strtotime (date/time string)".

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Method 1: Use the mktime() function

mktime() function returns the UNIX timestamp of a date

Syntax

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

Parameters:

• hour : Optional. Specified hours.

• minute: Optional. prescribed points.

• second: Optional. Specifies seconds.

• month: Optional. Specified month.

• day: Optional. Specify days.

• year: Optional. Specified year.

• is_dst: 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). Note: This parameter is deprecated in PHP 5.1.0. Instead, new time zone handling features are used.

Note: Parameters can be omitted from right to left. Any omitted parameters will be set to the current value of the local date and time.

Example

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

Method 2: Using the strtotime() function

The strtotime() function is used to convert dates represented by strings is the timestamp, returns the timestamp successfully, otherwise returns FALSE.

Syntax:

int strtotime ( string $time [, int $now = time() ] )

This function expects a string containing a US English date format and attempts to parse it into a Unix timestamp (since January 1 1970 00:00:00 GMT seconds), its value is relative to the time given by the now parameter. If this parameter is not provided, the current system time is used.

This function will use the TZ environment variable (if any) to calculate the timestamp. Since PHP 5.1.0 there is an easier way to define the time zone used in all date/time functions. This process is documented on the date_default_timezone_get() function page.

Parameters:

• time Required. Specifies a date/time string.

• #now Optional. Specifies the timestamp used to calculate the return value. If this parameter is omitted, the current time is used.

Example:

<?php
echo strtotime("2010-10-1 10:00:00")."<br>";
//输出 1285898400
echo strtotime("10 September 2018")."<br>";
//输出 1536508800
echo strtotime("+1 day");
//输出明天此时的时间戳
?>

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