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Do you run a website that uses PHP? Are you seeing the error message “Warning: session_start(): cannot send session cache limiter – headers already sent” every time you try to log in? Don’t worry, it’s not as complicated as it sounds! In this blog post, we’ll explain what this error is, why it occurs, and how to fix it.

Warning: session_start(): cannot send session cache limiter – headers already sent- Why do you encounter this message?

This message usually occurs in PHP when there is output sent to the browser before the session_start() function is called. This output can be anything, such as whitespace or HTML tags, that are sent before the session_start() function is executed.

When this happens, PHP cannot set the necessary session cookies to track the user’s session because headers have already been sent to the browser, and cookies can only be set before any output is sent. As a result, PHP throws the “cannot send session cache limiter – headers already sent” warning.

So, how to handle this headache error, don’t miss our useful solutions below.

How to solve the “Warning: session_start(): cannot send session cache limiter – headers already sent” error?

To eliminate this error, you can try one of the following steps

1. Make sure that there is no output sent to the browser before the session_start() function is called in your PHP file.
2. Check for any whitespace or HTML tags before the PHP opening tag or after the closing tag in your PHP file, and remove them.
3. If you have multiple PHP files, check each one for any output before the session_start() function is called.
4. If you’re including any files using the include() or require() function, ensure that there is no output in those files before the session_start() function is called.
5. If the issue persists, try adding ob_start() at the beginning of your PHP script to turn on output buffering. This will prevent any output from being sent to the browser until the script has finished executing.

By following these steps, you should be able to fix the “cannot send session cache limiter – headers already sent” error in PHP.

Finally

the Warning: session_start(): cannot send session cache limiter – headers already sent error can be a tricky issue to solve. Luckily, there are several steps that can be taken to troubleshoot and fix this issue. Hopefully, by following these steps, developers should be able to handle this error successfully.

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ET Digital Team

We’re a Digital Team from EngineTemplate with 5 content experts. Our team has 5 years exp in open source Joomla and WordPress, we make daily blogs and build useful resources for everyone who is having issues with open source while using it.