How can the use of ob_start() help prevent the "headers already sent" issue in PHP?

When PHP code tries to modify headers after they have already been sent to the browser, it results in the "headers already sent" error. This commonly occurs when there is whitespace or other output before the header modification. To prevent this issue, you can use ob_start() to buffer the output and prevent any premature output. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer
?>

Keywords

ob_start headers already sent PHP output buffering prevention

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