How to implement countdown in php: 1. Configure the daily activity time period; 2. Calculate the time difference between the server and the client; 3. Through "if(nMS>5*59*1000&&nMS<=5*60* 1000){...}" code can be used to implement the countdown.

#The operating environment of this article: Windows 7 system, PHP version 7.4, Dell G3 computer.

php How to calculate the countdown of how many days?

Detailed explanation of how to implement the real-time countdown function in php

The details are as follows:

In the past few days, the company is going to have a limited-time shopping function. This requires a countdown and a real-time countdown.

Requirements:

1) There must be a real-time countdown display of hours, minutes and seconds

2) Modifying the date and time on the client side will not affect the normal display of the countdown (that is, based on the server time)

In fact, this has the same requirements as the time limit function of many examination and other systems.

Solution ideas:

1) You cannot use ajax to obtain the server every second Time.

So the real-time countdown must be implemented with javascript. This is very simple. There are a lot of examples on the Internet.

2) The problem now is to solve the problem of how the user changes the date and time to our display. The impact.

The solution is to calculate the time difference between the client time and the server time. In this way, the problem is solved.

In this way, you only need to run php once. The real-time countdown time will be the same as the server time. The time is synchronized.

Theoretically it is synchronized, but in actual testing there will be an error of 1 second. (The specific reason is related to the network speed. The faster the network speed, the smaller the error), but this is by no means It will affect our above requirements.

Instance:

Code:

       
  
XX:XX:XX
  

Instance 2:

modified the above Some bugs

Code:

       
  
XX:XX:XX
  

Example 3:

Different ideas, much simpler.

Code:

       
  
XX:XX:XX
  

Recommended Study: "PHP Video Tutorial"

The above is the detailed content of How to calculate countdown in php. For more information, please follow other related articles on the PHP Chinese website!