In what situations is it not advisable to use the header() function in PHP?

It is not advisable to use the header() function in PHP after any output has been sent to the browser, as it will result in a "headers already sent" error. To avoid this issue, make sure to call the header() function before any output is sent, such as HTML content or whitespace. 

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

// Your PHP code here

header("Location: https://www.example.com"); // Redirect header

ob_end_flush(); // Flush output buffer
?>

Keywords

header function output buffering cookies redirection caching

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