How to add timestamp in php

Today, we will introduce how to add timestamp in PHP. A timestamp is a way of representing date and time as the total number of seconds from January 1, 1970 00:00:00 UTC to the current time, and is commonly used to record the timing and ordering of events. In PHP, we can use built-in functions to get the current timestamp and increment it using some simple algorithms.

Get the current timestamp
In PHP, we can use the built-in function time() to get the current timestamp. The time() function returns the total number of seconds from January 1, 1970 00:00:00 UTC to the current time. The following code demonstrates how to use the time() function to get the current timestamp:

$current_time = time();
echo "当前时间戳是：".$current_time;

We can assign the above code to the $current_time variable and then print it out. The result should be as follows:

当前时间戳是：1627413919

This timestamp indicates that the current time is July 27, 2021 10:58:39. Please note that the timestamp is calculated from midnight (00:00:00) Greenwich Mean Time (GMT), and China's time zone is GMT 8, so you need to add 28800 seconds (8 hours) to get the current China time.

Increase timestamp
In PHP, we can use a simple algorithm to increase timestamp. Suppose we want to add 1 hour to the current timestamp, we can use the following code:

$current_time = time();
$one_hour_later = $current_time + 3600;
echo "一小时后的时间戳是：".$one_hour_later;

Here we define a variable named $one_hour_later, its value is the current timestamp plus 3600 The result is obtained in seconds (i.e. 1 hour). We use a little trick to define 3600 seconds as a constant so that the code is easier to read and maintain.

Similarly, we can use similar methods to add other time units, such as minutes, days, weeks, etc. The following code demonstrates how to add 3 days to the current timestamp:

$current_time = time();
$three_days_later = $current_time + 3*24*3600;
echo "三天后的时间戳是：".$three_days_later;

Here we use a calculation similar to "3 x 24 x 3600", where 24 means that there are 24 hours in a day , 3600 means there are 60 minutes in one hour and 60 seconds in each minute. You can also use PHP's built-in functions to convert time units, such as using the date() function to convert a timestamp into date format.

Summary
Timestamps are a way to represent dates and times, and can be easily obtained and processed in PHP. We can use the time() function to get the current timestamp and use a simple algorithm to increment the timestamp value. In actual development, we can combine other PHP functions and algorithms to process timestamps and use them to implement various useful functions.

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