How can cookies be properly set in PHP to avoid issues with header information already being sent?

When setting cookies in PHP, it is important to ensure that no output has been sent to the browser before setting the cookie. To avoid issues with header information already being sent, you can use the ob_start() function to buffer output and then set the cookie before sending any output to the browser. 

<?php
ob_start();
// set cookie
setcookie("cookie_name", "cookie_value", time() + 3600, "/");
ob_end_flush();
?>

Keywords

setcookie headers_sent ob_start ob_end_flush output buffering

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