How does the PHP version affect the use of header function for redirection?

The PHP version affects the use of the header function for redirection because in PHP 5.3 and later versions, output buffering must be turned off before using the header function to avoid "headers already sent" errors. To solve this issue, you can simply turn off output buffering using the ob_end_clean() function before using the header function for redirection.

ob_end_clean();
header("Location: newpage.php");
exit();