What are the potential pitfalls of setting cookies in PHP, especially in relation to header commands?

Setting cookies in PHP can lead to potential pitfalls, especially when done after any output has been sent to the browser. This can result in "headers already sent" errors, as cookies must be set before any output is sent to the browser. To avoid this issue, make sure to set cookies before any output is generated, typically at the beginning of the script. 

<?php
// Set cookies before any output
setcookie("cookie_name", "cookie_value", time() + 3600, "/");
?>

Keywords

cookies PHP header commands security vulnerabilities session hijacking

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