What are the best practices for maintaining input data in text input fields after form submission in PHP?

After a form submission in PHP, it is a good practice to maintain the input data in text input fields so that users do not have to re-enter the information if there are validation errors. This can be achieved by storing the submitted data in session variables and populating the input fields with the session data if it exists. 

```php
// Start the session
session_start();

// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Store the submitted data in session variables
    $_SESSION['name'] = $_POST['name'];
    $_SESSION['email'] = $_POST['email'];
    // Add more fields as needed
}

// Populate the input fields with session data if it exists
$name = isset($_SESSION['name']) ? $_SESSION['name'] : '';
$email = isset($_SESSION['email']) ? $_SESSION['email'] : '';

// Clear the session data after populating the input fields
unset($_SESSION['name']);
unset($_SESSION['email']);
// Add more fields as needed
```
This code snippet demonstrates how to store input data in session variables after form submission and then populate the input fields with the session data. It also includes clearing the session data after populating the input fields to ensure that the data is not persisted unnecessarily.

Keywords

PHP form submission input data text input fields data persistence

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