What steps can be taken to troubleshoot and resolve errors related to headers already being sent before session_start() in PHP files?

When headers are sent before session_start() in PHP files, it typically means that there is whitespace or output being sent to the browser before the session is started. To resolve this issue, make sure there is no whitespace before the <?php tag and that there are no echo or print statements before session_start(). 

```php
&lt;?php
ob_start(); // Start output buffering
session_start(); // Start the session
```
By using output buffering with ob_start(), any output generated before session_start() will be stored in a buffer instead of being sent to the browser. This allows you to start the session without any headers being sent prematurely.

Keywords

headers session_start() troubleshooting errors PHP files

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