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This article introduces the relevant knowledge of "how to realize the countdown to php". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Php to achieve countdown methods: 1, through the date_default_timezone_set to set the time zone; 2, to configure the daily active time period; 3, to calculate the time difference between the server and the client; 4, through the "function GetRTime () {...}" method to achieve the countdown.

This article operating environment: Windows7 system, PHP7.1 version, DELL G3 computer

How does php realize the countdown?

Detailed explanation of the realization method of php real-time countdown function

The details are as follows:

The company is going to do a time-limited shopping function these days. This is to achieve the countdown, there must be a real-time countdown.

Request:

1) the display of real-time countdown of hours, minutes and seconds

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

In fact, this is the same requirement as the time limit function of many examinations and other systems.

The solution is as follows:

1) you can't use ajax to get server time every second.

Therefore, the real-time countdown must be realized with javascript. There's nothing to it。 A lot of examples on the Internet.

2) now the problem is to solve the impact of client modification date and time on our display.

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

You only need to run php. Net once. The real-time countdown time is synchronized with the server time.

The theory is synchronous, but the actual test will have 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 will never affect our above requirements.

Example:

Code:

Real-time countdown to PHP! XX:XX:XX

Example 2:

Modified some of the bug above

Code:

Real-time countdown to PHP! XX:XX:XX

Example 3:

The train of thought is different, it is much simpler.

Code:

PHP real-time countdown! this is the end of XX:XX:XX 's "how to achieve php countdown". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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