What are common issues with session and cookie handling in PHP, as seen in the provided code snippet?

The common issue with session and cookie handling in PHP is that the session_start() function should be called before any output is sent to the browser. This is because sessions use cookies to store session IDs, and cookies must be set in the HTTP header before any content is sent. To solve this issue, move the session_start() function to the beginning of the PHP script, before any HTML or output. 

<?php
session_start();

// Rest of the PHP code goes here
?>

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session cookie handling PHP code snippet

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