How can one ensure that no output is generated before calling session_start() in PHP scripts?

To ensure that no output is generated before calling session_start() in PHP scripts, you can use output buffering. Output buffering allows you to capture all output generated by your script before sending it to the browser. By using ob_start() at the beginning of your script, you can prevent any unintended output before calling session_start(). 

<?php
ob_start();
session_start();

// Your PHP code here
?>

Keywords

session_start output buffering ob_start headers_sent PHP script

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