What are some best practices to avoid "Headers already sent" errors in PHP when setting cookies?

When setting cookies in PHP, it's important to ensure that no output is sent to the browser before calling the `setcookie()` function to avoid "Headers already sent" errors. To prevent this issue, make sure to set cookies before any HTML content or whitespace is echoed or printed in your PHP script. 

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

// Set cookies
setcookie("cookie_name", "cookie_value", time() + 3600, "/");

ob_end_flush(); // Flush output buffer
?>

Keywords

PHP Headers Cookies Output buffering ob_start

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