Debian timed php Setup method

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Recently followed the eldest brother to learn how to do the site, they bought a VPS, is going to build a site in the work of the usual after the application of the study to see the effect. The so-called practice of truth. The first problem that comes up is. PHP scripts are required to do something regularly. In fact, there are two ways to plan your PHP tasks:

1. Let the server execute the PHP script regularly. 2. Judge the time when the user accesses the script, and then perform the tasks before the page is exported. (The latter is not really about execution, just before the user finishes the thing, and then the user looks like it's timed to execute)

The second method, although simple, requires users to visit PHP each time to determine whether the task is executed according to time. Every time it comes to unnecessary consumption. Since I bought VPS then, let the server do these things well. My VPS is using the Debian system. Baidu just a moment ago set the method of planning tasks, the test of their own really effective, set the method as follows:

1. After landing the VPS to run the command: Vi/etc/crontab

2. Here you can add commands for scheduled tasks.

3. Command explanation: The Scheduled Task command is divided into three parts. 1. Time 2. User 3. Tasks performed

You can find a way to set the time from the following command:

3:00 Daily:

0 3 * * * Root command

Every Sunday 8:30:

8 * * 7 root command

1 weeks 5 0 o'clock per week:

0 0 * * 1,5 root command

May 12 14 o'clock every year:

0 5 * Root command

Every 15 minutes from 18 o'clock in the evening to 23 points:

*/15 18-23 * * * Root command

Instance：

Visit a PHP script once per minute:

* */1 * * * Root wget-o/var/log/cron.txt http://www.4j4j.cn/

Check whether PHP automatically runs every minute, you can see the Var/log/cron.txt file, whether it is the site PHP returned content on it! Before think very complex very difficult things, in fact, as long as serious Baidu, do more experiments, basic can learn. Hope also just start to learn how to do Web site users can also stick to learning.