How can you prevent the "headers already sent" error when using header() in PHP?

When using the header() function in PHP, it is essential to ensure that no output is sent to the browser before calling this function. If any content is sent before headers, PHP will throw a "headers already sent" error. To prevent this error, you can use output buffering to buffer all output before sending any headers. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer and send content to the browser

Keywords

header output buffering ob_start ob_end_flush error_reporting

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