In the provided PHP script, what potential pitfalls or errors could lead to the header modification issue?

The issue with modifying headers in PHP typically arises when there is output sent to the browser before the header modification. To solve this, ensure that no output is sent to the browser before calling the header() function. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer and send it to the browser
header('Location: new_page.php'); // Redirect to a new page
exit(); // Ensure no further code is executed after the header modification
?>

Keywords

PHP header modification output buffering headers_sent ob_start

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