What are some potential solutions to prevent previously entered values from showing up in PHP forms?

To prevent previously entered values from showing up in PHP forms, you can use the POST-Redirect-GET pattern. This involves processing the form submission data, storing it in a session variable, redirecting to a different page, and then displaying the form with empty fields. This way, if the user refreshes the page, the form will be displayed without the previously entered values. 

<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $_SESSION['form_data'] = $_POST;
    header("Location: ".$_SERVER['PHP_SELF']);
    exit();
}

// Display form with empty fields or previously entered values
$data = isset($_SESSION['form_data']) ? $_SESSION['form_data'] : [];
unset($_SESSION['form_data']);

?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="text" name="username" value="<?php echo isset($data['username']) ? $data['username'] : ''; ?>">
    <input type="password" name="password" value="">
    <button type="submit">Submit</button>
</form>

Keywords

PHP form input session validation

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