What are the methods to implement scheduled tasks in PHP?

php methods to implement scheduled tasks are: 1. Use the crontab under the Linux system to implement; 2. Use the ignore_user_abort function to implement; 3. Use the file_get_contents function to implement.

1. Server scheduled tasks

Server scheduled tasks are actually under unix systems crontab implementation, specific settings: Linux scheduled task crontab; however, in addition to directly reading PHP scripts regularly, we can also use scheduled interface calls.

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When running the script:

*/1 * * * * php /data/www/cron.php Execute cron.php every minute

URL mode call:

lynx mode:*/1 * * * * lynx -dump http://www. xxxxxxx.com/cron.php (-dump option to convert the URL output to standard output)

curl method: */1 * * * * /usr/bin/curl -o temp.txt http: //www.xxxxxxx.com/cron.php (Curl displays output on standard output by default. Use the "curl -o" option to dump the output of the script to the temporary file temp.txt)

wget method: */1 * * * * /usr/bin/wget -q -O temp.txt http://www.xxxxxxx.com/cron.php (the q option indicates quiet mode. "-O temp.txt" indicates that the output will Send to a temporary file.)

The above method is to place the php script in an address that can be accessed using a URL, such as http://www.xxxxxx.com/cron.php, and call the trigger task regularly.

2. ignore_user_abort() method

ignore_user_abort() function sets whether disconnecting from the client will terminate the execution of the script.

First use a cron.php file to control the termination of the script. The content of cron.php is:

The script php file is:

        

         Copy after login
        
       

By changing the cron.php return 0 , to stop the program. But this method is not good at memory management.

3. file_get_contents() method

php script sleep continues to execute after a period of time by accessing itself. This ensures that the execution time of each PHP script will not be too long and will not be affected by time_out limit. Because each loop of the php file is executed independently, this method avoids the time_out limit. But it is best to add the control code cron.php as above so that the process can be terminated.

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