What is the common error message associated with setting sessions in PHP and how can it be resolved?

The common error message associated with setting sessions in PHP is "session_start(): Cannot start session when headers already sent". This error occurs when there is any output (even a single whitespace) before the session_start() function is called. To resolve this issue, make sure to call session_start() at the beginning of your PHP script, before any HTML or whitespace is outputted. 

<?php
// Start the session at the very beginning of your PHP script
session_start();

// Rest of your PHP code goes here
?>

Keywords

PHP session error message resolution session_start

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