What are some best practices for handling multi-page forms in PHP to avoid header already sent errors?

When handling multi-page forms in PHP, it is important to ensure that no output is sent to the browser before headers are set. To avoid "header already sent" errors, you can use output buffering to capture all output before sending it to the browser. 

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

// Your PHP code for processing form data goes here

// Redirect to the next page
header("Location: next_page.php");
exit();

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

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