Are there any common pitfalls or errors that developers may encounter when using setcookie and header functions in PHP?

One common pitfall when using setcookie and header functions in PHP is that they must be called before any output is sent to the browser. If these functions are called after output has been sent, they will not work properly. To solve this issue, make sure to call setcookie and header functions at the beginning of your PHP script, before any HTML or text is echoed. 

<?php
// Correct way to set a cookie and redirect using headers
setcookie("user", "John Doe", time() + 3600, "/");
header("Location: index.php");
exit;
?>

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setcookie header PHP errors pitfalls

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