What are the potential pitfalls of mixing HTML and PHP code for form input fields?

Mixing HTML and PHP code for form input fields can lead to messy and hard-to-maintain code. It can also make it difficult to separate the presentation layer from the logic layer of the application. To solve this issue, it's recommended to use PHP to generate the form input fields dynamically, keeping the HTML markup separate from the PHP logic. 

<?php
// Example of generating form input fields dynamically using PHP
$firstName = isset($_POST['firstName']) ? $_POST['firstName'] : '';
$lastName = isset($_POST['lastName']) ? $_POST['lastName'] : '';

echo '<form method="post">';
echo 'First Name: <input type="text" name="firstName" value="' . $firstName . '"><br>';
echo 'Last Name: <input type="text" name="lastName" value="' . $lastName . '"><br>';
echo '<input type="submit" value="Submit">';
echo '</form>';
?>

Keywords

HTML PHP form input fields XSS attacks security vulnerabilities

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