How can the issue of headers already sent be prevented when setting cookies in PHP?

When setting cookies in PHP, the issue of "headers already sent" can be prevented by ensuring that no output is sent to the browser before calling the setcookie() function. This error occurs when there is any output (such as HTML, whitespace, or error messages) before setting the cookie headers. To prevent this issue, make sure to set cookies before any output is generated in the PHP script. 

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

// Set cookies
setcookie('cookie_name', 'cookie_value', time() + 3600, '/');

ob_end_flush(); // Flush the output buffer
?>

Keywords

headers_sent ob_start setcookie output buffering error_reporting

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