how to set cron job from php script?

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Happy的楠姐
Happy的楠姐 2021-02-06 06:02

i am new to cron job . i studied some basics about cron job . i can able to call php using cron tab. By using following command in /etc/crontab

  10 *    * * *           


        
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  • 2021-02-06 06:37

    Many environments do not permit writing to a text file from a php page called from the web. I agree that this is a security risk that one should not take.

    I have a webpage save data to a MySQL table via a JQuery call to a php script. In Cron, I schedule another php script to, every so often, check data in MySQL table and execute whatever jobs necessary.

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  • 2021-02-06 06:39

    You should be able to add it directly

    echo "2 * * * * /usr/bin/php /var/www/PATH TO THE SCRIPT/crontest1.php\n" > /etc/cron.d/username
    
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  • 2021-02-06 06:40

    From How can I set cron job through PHP script by Nick Clark:

    This will add a script that runs every day at 9:30am.

    exec('echo -e "`crontab -l`\n30 9 * * * /path/to/script" | crontab -');
    

    You may run into problems with permissions if you are running this script from a web server. To get around this, I would suggest a different approach.

    Here is one possible solution. Create a list of scripts that need to be run. You can save this in a text file or in a database. Create a script to read this list and run it every minute or every 5 minutes (using a cronjob). Your script will need to be smart enough to decide when to run the list of scripts and when to simply exit.

    You can do like this..

    Other links:

    Install a cron job with a php script

    How to invoke cron job from php script?

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