Are there any specific rules or guidelines to follow when using setcookie() and header() functions in PHP to avoid conflicts?

When using setcookie() and header() functions in PHP, it is important to remember that both functions are used to send headers to the browser. To avoid conflicts, make sure to call setcookie() before any output is sent to the browser, as it sets a cookie header. If you need to set cookies after output has already been sent, you can use output buffering to capture the output and then send the cookie headers. 

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

// Set cookie before any output
setcookie("user", "John Doe", time() + 3600, "/");

ob_end_flush(); // Flush the output buffer and send headers

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setcookie header conflicts guidelines rules

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