How to modify system scheduled tasks in php

With the rapid development of Internet technology, many websites need to complete some automated operations through system scheduled tasks. For example, data backup, log cleaning, etc. Among these system scheduled tasks, PHP scheduled tasks are the most widely used. Therefore, the modification of PHP scheduled tasks is very important for website operation and maintenance personnel.

Generally speaking, PHP scheduled tasks can be implemented through crontab. Here, we modify the PHP system scheduled tasks through the Linux system. The specific operations are as follows:

1. Open your VPS or remote connection (SSH)

The modification of scheduled tasks needs to be completed in the Linux system, therefore, you first need to open your VPS or remote connection. If you are operating on a Windows system, please first use an SSH client to connect to your Linux system and log in. If you don't know how to connect to a remote Linux system, please learn basic Linux system commands first.

2. Edit crontab command

In Linux systems, we can use the crontab command to edit PHP scheduled tasks. The format of the crontab command is as follows:

crontab [-u user] [-l | -r | -e] [-i] [-s] [-c file] [file]

Among them, the -u parameter is used to specify the user and can generally be omitted. The -l parameter is used to list all scheduled tasks of the current user, the -e parameter is used to edit scheduled tasks, the -r parameter is used to delete scheduled tasks, # The ##-i parameter is used to confirm before deleting the scheduled task, the -s parameter is used to re-read the crontab file, and the -c parameter is used to specify the crontab file.

Edit PHP scheduled tasks

Use the following command to open the crontab editor:

crontab -e

This command will open a text editor in which you can Edit your PHP scheduled tasks. If you do not specify a crontab file, the editor will open the

~/crontab file by default.

In the editor, you need to set your PHP scheduled task according to the following format:

* * * * * /path/to/php /path/to/file.php

Among them,

* * * * * represents the time setting of the scheduled task, The order is:

minutes (0-59)
• hours (0-23)
• days (1-31)
• months ( 1-12)
• Week of the week (0-7, where 0 and 7 both represent Sunday)

Here, we can use

* to represent any value, For example, * * * * * means execution once every minute. If you want the scheduled task to be executed only at a fixed time, you can set it as follows:

0 0 * * * /path/to/php /path/to/file.php

This setting means that it will be executed once every day at 00:00.

Finally,

/path/to/php represents the installation path of PHP, and /path/to/file.php represents the PHP file to be executed.

Save and Exit

After you finish editing, press

Ctrl X to save and exit the editor. If you try to exit without saving your changes, the editor will prompt you to save your changes.

Summary

This article introduces the method of modifying PHP scheduled tasks by editing crontab commands in the Linux system, which mainly includes opening VPS or remote connection, editing crontab commands, editing PHP scheduled tasks, and saving and exiting Wait for steps. When you need to modify PHP scheduled tasks, you can follow the above steps.

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