How can one ensure that no output is sent before setcookie or session_start in PHP to avoid header modification errors?

To ensure that no output is sent before setcookie or session_start in PHP to avoid header modification errors, you should make sure that these functions are called before any output is sent to the browser. This can be achieved by placing these functions at the very beginning of your PHP script, before any HTML, whitespace, or even PHP opening tags. 

<?php
// Ensure no output is sent before setcookie or session_start
ob_start(); // Start output buffering
session_start(); // Start the session
setcookie("example_cookie", "value", time() + 3600, "/"); // Set a cookie

// Rest of your PHP code goes here
?>

Keywords

setcookie session_start output buffering headers already sent PHP error

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