How can PHP developers allow users to edit their input data after submitting a form?

To allow users to edit their input data after submitting a form, PHP developers can save the submitted data in session variables and pre-fill the form fields with this data when the form is displayed again. This allows users to make changes to their input before submitting it again. 

<?php
session_start();

// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Save form data in session variables
    $_SESSION['name'] = $_POST['name'];
    $_SESSION['email'] = $_POST['email'];
    // Add more fields as needed
    // Redirect to the form page to display the form with pre-filled data
    header("Location: form.php");
    exit();
}

// Display the form with pre-filled data if available
$name = isset($_SESSION['name']) ? $_SESSION['name'] : '';
$email = isset($_SESSION['email']) ? $_SESSION['email'] : '';
// Add more fields as needed

?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="text" name="name" value="<?php echo $name; ?>" placeholder="Name">
    <input type="email" name="email" value="<?php echo $email; ?>" placeholder="Email">
    <!-- Add more fields as needed -->
    <button type="submit">Submit</button>
</form>

Keywords

PHP form submission user input data editing validation.

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