What are the potential pitfalls of trying to read HTML values with PHP in the same file?

When trying to read HTML values with PHP in the same file, a potential pitfall is that PHP may not be able to access the HTML values if they are not properly submitted through a form or passed as parameters in the URL. To solve this issue, you can use PHP to check if the values are set before trying to access them. 

<?php
if(isset($_POST['html_value'])) {
    $html_value = $_POST['html_value'];
    // do something with $html_value
}
?>

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