How can PHP sessions affect XHTML validation and what are common issues that arise?

PHP sessions can affect XHTML validation by potentially adding unwanted whitespace or characters to the output, causing validation errors. To solve this issue, you can use the `session_start()` function at the beginning of your PHP script and then use `session_write_close()` before any output is sent to the browser. 

<?php
session_start();

// Your PHP code here

session_write_close();
?>

Keywords

PHP sessions XHTML validation common issues session variables headers_sent.

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