PHP Execution Plan Task

Implement the daemon process on a Linux terminal. You can use crontab to plan PHP script execution.

The crontab command schedules the execution of some commands at certain intervals.

 

Crontab usage: crontab [-e |-l |-r] File Name-e: Edit task-l: Display task information-r: delete scheduled execution task information

 

Crontab format:
* *** Command
Command to be run by hour, day, month, and week

"*" Indicates all numbers in the value range, "/" indicates each meaning, and "*/5" indicates every five units, "-" represents a number from a number to a number, "," separate several discrete numbers.

 

1. directly use the crontab command to edit

Crontab allows you to schedule tasks for users.

Crontab-u // set a user's cron service. Generally, the root user needs this parameter when executing this command.

Crontab-l // list the details of a user's cron Service

Crontab-r // delete a user's cron Service

Crontab-e // edit a user's cron Service

 

For example, to view your cron settings as root: crontab-u root-l

For another example, root wants to delete fred's cron settings: crontab-u fred-r

When editing the cron service, edit the cron settings of the root user, enter crontab-u root-e, and enter the vi editing mode. The edited content format is *** command

 

For example, to execute a task:

The task needs to run the PHP script once every minute, record the execution time, and save it to result. log.

 

Start. php:

#! /Usr/bin/php

<? Php

File_put_contents ('result. log', 'current running time: '. date ("Y-m-d", time (). "/r/n", FILE_APPEND );

 

Shell. sh:

#! /Bin/sh

Php start. php

 

Terminal:

Crontab-u root-e

# Enter the vim editing mode:

*/1 * shell. sh

: Wq exit and save

Www.2cto.com
 

In addition, the PHP script can be executed even if the Client is disconnected (for example, the browser is closed) on the WEB page.

The ignore_user_abort () function can be used with set_time_limit (0) and sleep ($ interval) to implement the program.

<? Php
Ignore_user_abort (); // The PHP script can be executed even if the Client is disconnected (such as the browser is disabled.
Set_time_limit (0); // the execution time is unlimited. The default php Execution time is 30 seconds. You can use set_time_limit (0) to limit the execution of the program.
$ Interval = 60*5; // run every 5 minutes
Do {
$ Fp = fopen('test.txt ', 'A ');
Fwrite ($ fp, 'test ');
Fclose ($ fp );
Sleep ($ interval); // wait for 5 minutes
} While (true );
?>
<? Php
Ignore_user_abort (); // The PHP script can be executed even if the Client is disconnected (such as the browser is disabled.
Set_time_limit (0); // the execution time is unlimited. The default php Execution time is 30 seconds. You can use set_time_limit (0) to limit the execution of the program.
$ Interval = 60*5; // run every 5 minutes
Do {
$ Fp = fopen('test.txt ', 'A ');
Fwrite ($ fp, 'test ');
Fclose ($ fp );
Sleep ($ interval); // wait for 5 minutes
} While (true );
?>

As long as you run the above page, and then turn it off, the program will continue to run.

 

From God's blog