What potential issues can arise when using header Location in PHP for page redirection?

One potential issue that can arise when using header Location in PHP for page redirection is that it must be used before any output is sent to the browser. If there is any output sent before the header function is called, it will result in a "headers already sent" error. To solve this issue, you can use output buffering to capture any output before sending headers.

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

// Your PHP code here

header("Location: new_page.php");
exit();

ob_end_flush(); // Flush the output buffer
?>