What are some potential causes for the error message related to modifying header information in PHP?

The error message related to modifying header information in PHP typically occurs when there is an attempt to send headers after content has already been output to the browser. To solve this issue, ensure that no output is sent to the browser before calling functions like `header()` or `setcookie()`. Another common solution is to use output buffering to capture any output before sending headers. 

<?php
ob_start(); // Start output buffering

// Your PHP code here

ob_end_flush(); // Flush the output buffer and send headers
?>

Keywords

header PHP output buffering session_start ob_start

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