How can one troubleshoot and resolve issues related to headers and cookies in PHP?

To troubleshoot and resolve issues related to headers and cookies in PHP, you can start by checking if there are any output sent to the browser before setting headers or cookies. Make sure to set headers before any output is sent using the header() function and set cookies before any output is sent using the setcookie() function. Additionally, ensure that there are no whitespace characters or any other characters sent before setting headers or cookies. 

<?php
// Set headers before any output
header("Content-Type: text/html");

// Set cookies before any output
setcookie("user", "John Doe", time() + 3600, "/");
?>

Keywords

HTTP headers cookies troubleshooting PHP functions error handling

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