What is the significance of the error "Cannot send session cookie" in PHP web development?

The error "Cannot send session cookie" typically occurs when session_start() is called after headers have already been sent to the browser. To solve this issue, make sure to call session_start() at the beginning of the script before any output is sent to the browser. 

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

// Your PHP code here
?>

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PHP session cookie error message web development significance

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