What are some common causes of the "headers already sent" error in PHP scripts?

The "headers already sent" error in PHP scripts occurs when there is output sent to the browser before PHP sends HTTP headers. This can be caused by whitespace or text outside of PHP tags before the `header()` function is called. To solve this issue, make sure to avoid any output before calling `header()` functions in your PHP scripts. 

<?php
ob_start(); // Start output buffering
// Your PHP code here
header('Location: new_page.php'); // Example of using header function
ob_end_flush(); // Flush output buffer and send content to the browser
?>

Keywords

output buffering whitespace include files UTF-8 encoding session_start

Related Questions