What are the best practices for handling headers already sent errors in PHP scripts?

Headers already sent errors occur when PHP tries to send HTTP headers to the client, but output has already been sent to the browser. To solve this issue, make sure there is no whitespace or output before the header() function is called. You can also use ob_start() to buffer the output until the headers are sent. 

<?php
ob_start();

// Your PHP code here

header('Location: newpage.php');
exit;

Keywords

output buffering ob_start headers_sent error_reporting error suppression

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