How can the issue of headers already being sent be prevented in PHP?

The issue of "headers already sent" in PHP occurs when output is sent to the browser before calling the header() function to set HTTP headers. To prevent this issue, make sure that no output is sent before calling header() by placing the header() function at the beginning of the script or using output buffering. 

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

// Your PHP code here

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

Keywords

output buffering ob_start ob_end_flush header ob_clean

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