How can the "headers already sent" error be resolved when setting cookies in PHP?

When setting cookies in PHP, the "headers already sent" error can be resolved by ensuring that no output is sent to the browser before setting cookies. This error occurs when PHP tries to set a cookie after output has already been sent to the browser. To fix this, make sure that there is no whitespace or any other output before the `setcookie()` function is called. 

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

// Your PHP code here

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

ob_end_flush(); // Flush output buffer and send output to the browser
?>

Keywords

headers cookies PHP output buffering ob_start

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