What potential issues can arise when trying to set a session value in PHP, as seen in the provided code?

When trying to set a session value in PHP, potential issues can arise if the session has not been started or if there is output sent to the browser before setting the session value. To solve this issue, make sure to start the session before setting any session values and ensure that there is no output sent to the browser before setting the session value. 

<?php
// Start the session
session_start();

// Set the session value
$_SESSION['key'] = 'value';
?>

Keywords

session value PHP code errors

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