What is the purpose of the constant SID in PHP sessions?

The purpose of the constant SID in PHP sessions is to provide a way to pass the session ID in URLs when cookies are not available. This can be useful in scenarios where cookies are disabled or not supported by the client's browser. By using the SID constant, you can ensure that the session ID is always included in URLs, allowing for session management even without cookies. 

<?php
session_start();
$session_id = session_id();
echo "<a href='page.php?" . SID . "'>Click here</a> to pass session ID in URL";
?>

Keywords

constant SID PHP sessions session ID session management

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