When using header('Location: xxx') in PHP, what are the considerations for positioning it within the code to avoid errors?

When using header('Location: xxx') in PHP to redirect users to another page, it is important to ensure that this function is called before any output is sent to the browser. Placing the header function after any HTML content or whitespace will result in an error, as headers must be sent before any content. To avoid this issue, place the header function at the very beginning of your PHP script, before any HTML or whitespace. 

<?php
// Place the header function at the very beginning of your PHP script
header('Location: new_page.php');
exit;
?>

Keywords

header Location PHP errors positioning

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