How can headers already sent errors be prevented when using header() in PHP?

Headers already sent errors in PHP occur when there is output (like HTML, whitespace, or error messages) sent to the browser before the header() function is called. To prevent this error, ensure that no output is sent before calling the header() function. You can achieve this by placing the header() function at the beginning of the PHP script before any output or using output buffering to capture any output before sending headers. 

<?php
ob_start(); // Start output buffering
header("Location: https://www.example.com"); // Redirect to a new page
ob_end_flush(); // Flush the output buffer
?>

Keywords

headers_sent ob_start ob_clean output buffering error prevention

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