Are there best practices or guidelines to follow when using the header function in PHP to avoid errors?

When using the header function in PHP, it is important to ensure that no output has been sent to the browser before calling the function. This is because the header function is used to send HTTP headers to the browser, and any output before it will result in a "headers already sent" error. To avoid this error, make sure to call the header function before any output, including HTML, whitespace, or even a blank line. 

<?php
ob_start(); // Start output buffering
// Any code that might output content goes here

// Call the header function before any output
header("Location: http://www.example.com");
ob_end_flush(); // Flush the output buffer and send content to the browser
?>

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