How can PHP variables stored in sessions be utilized in HTML forms for interactive user input?

To utilize PHP variables stored in sessions in HTML forms for interactive user input, you can simply echo the session variable value as the default value in the form input fields. This allows the user to see the existing value and make changes if needed. 

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

// Set the session variable
$_SESSION['username'] = 'JohnDoe';

?>

<form action="process_form.php" method="post">
    <label for="username">Username:</label>
    <input type="text" id="username" name="username" value="<?php echo $_SESSION['username']; ?>">
    <button type="submit">Submit</button>
</form>

Keywords

PHP sessions variables HTML forms user input

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