What best practices should PHP developers follow to avoid conflicts between PHP code and HTML output that lead to session cookie errors?

To avoid conflicts between PHP code and HTML output that lead to session cookie errors, PHP developers should ensure that no output is sent to the browser before setting session cookies. This can be achieved by placing session_start() at the beginning of the PHP script, before any HTML or whitespace. Additionally, developers should avoid using the closing PHP tag ?> to prevent accidental whitespace or HTML output after the script has finished executing. 

<?php
session_start();

// Your PHP code here
?>
<!DOCTYPE html>
<html>
<head>
    <title>Example Page</title>
</head>
<body>
    <h1>Hello, World!</h1>
</body>
</html>

Keywords

PHP HTML output session cookie conflicts errors

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