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Editorial Team
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Asked: 2026-05-19T16:08:46+00:00

I have created a cron job at my webserver. That cron runs a php

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I have created a cron job at my webserver. That cron runs a php file every few hours. It’s cache creating technique. But there’s a problem – my cron command looks like this: php -q /folder/phpfile.php . When i run “phpfile.php” directly from my browser, everything is ok, but when CRON runs that file, it ALWAYS outputs “headers already sent” error to “error_log”! Mentioned php file DO begins with if(!isset($_SESSION)) session_start(); but “error_log” show that exactly “session_start()” line is throwing the warning!

What’s wrong? Why is everything ok when i run that file with browser, but when cron does it, “headers already sent” is generated?

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1 Answer

  1. Editorial Team

    Reason why it works in browser is probably because you have different php.ini settings for your web server and for cli-php.

    output_buffering directive is apperantly ON in your web-server and turned off in cli-php and it is right thing. Because no one wants to wait for content till script ends a job. We want to see what is happening when script is running.

    Wrong thing is that you send header with a cli script. Session is not really need in terminal, is it?

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