What are the best practices to avoid errors related to headers already sent in PHP?

When encountering the "headers already sent" error in PHP, it typically means that some content has already been output to the browser before headers are sent. To avoid this error, make sure that there is no whitespace or any other output before the `header()` function is called. One common practice is to move all `header()` functions to the beginning of the script before any output is sent. 

<?php
ob_start(); // Start output buffering

// Place all header functions at the beginning of the script
header("Location: https://www.example.com");
exit();

Keywords

output buffering ob_start headers_sent ob_clean ob_end_clean

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