How can the issue of headers being sent before starting a session be prevented in PHP files?

Issue: Headers being sent before starting a session in PHP can be prevented by ensuring that no output is sent to the browser before calling session_start(). This can be achieved by moving the session_start() function to the very beginning of the PHP file, before any HTML or whitespace. 

<?php
session_start();

// rest of the PHP code goes here
?>

Keywords

headers_sent session_start output buffering ob_start ob_end_clean

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