What best practices should PHP developers follow to handle session_start() and header() functions in their code to prevent header modification errors?

When using session_start() and header() functions in PHP code, it's important to ensure that session_start() is called before any output is sent to the browser, as header() must be called before any actual output is sent. To prevent header modification errors, developers should always call session_start() at the beginning of their code and handle any header modifications before sending any output. 

<?php
// Start the session before any output
session_start();

// Set headers before any output
header('Content-Type: text/html');

// Rest of the PHP code
?>

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