How can PHP developers prevent header already sent errors when trying to set the content type in PHP scripts?

To prevent header already sent errors when trying to set the content type in PHP scripts, developers should ensure that no output is sent to the browser before setting the content type using the header() function. This can be achieved by placing the header() function at the very beginning of the script, before any HTML or whitespace characters. 

<?php
ob_start(); // Start output buffering
header('Content-Type: text/html'); // Set the content type before any output
// Rest of the PHP script goes here
ob_end_flush(); // Flush output buffer and send output to the browser

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