How to change time to timestamp in php

In PHP, timestamp is a very common data type, usually used to store and calculate time. The timestamp is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC. It can be used to represent the current time or a custom date and time. In this article, we will introduce how to change time into timestamp in PHP.

1. Use PHP built-in functions

In PHP, there is a built-in function time() that can be used to obtain the timestamp of the current time. We just need to call the function in the code and store the result into a variable to get the timestamp of the current time. For example:

$timestamp = time();
echo $timestamp; // 输出当前时间戳

If you want to specify a specific date and time to get its timestamp, you can use the strtotime() function. This function converts date and time strings to timestamps and returns the timestamps. For example:

$date = "2022-02-22 22:22:22";
$timestamp = strtotime($date);
echo $timestamp; // 输出指定日期时间的时间戳

2. Use the DateTime class

In PHP, there is also a DateTime class, which provides some powerful methods to create, format and compare Date and time. Convert dates and times to timestamps more conveniently using the DateTime class.

First, you need to create a DateTime object to represent a date or time. This can then be converted to a timestamp using the getTimeStamp() method. For example:

$date = new DateTime('2022-02-22 22:22:22');
$timestamp = $date->getTimestamp();
echo $timestamp; // 输出指定日期时间的时间戳

3. Use the date_parse() function

Another way to change the time into a timestamp is to use the date_parse() function. This function parses a date and time string into an array and returns an associative array containing the year, month, day, hour, minute, second, etc. Next, you can use the mktime() function to convert this information into a timestamp. For example:

$date_string = '2022-02-22 22:22:22';
$date_parts = date_parse($date_string);
$timestamp = mktime($date_parts['hour'], $date_parts['minute'], $date_parts['second'], $date_parts['month'], $date_parts['day'], $date_parts['year']);
echo $timestamp; // 输出指定日期时间的时间戳

To sum up, converting date and time into timestamp is a common need, and PHP provides a variety of methods to achieve this process. From using PHP built-in functions, the DateTime class, to the date_parse() function, each approach has its own unique advantages and uses. Based on actual needs, choosing the appropriate method can complete code writing more quickly and efficiently.

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