What are the best practices for handling form data errors in PHP, specifically when trying to return to the form with the data intact using sessions?

When handling form data errors in PHP and trying to return to the form with the data intact using sessions, it is important to store the form data in sessions before displaying the form again with the errors. This ensures that the user does not have to re-enter all the form data when correcting errors. 

```php
<?php
session_start();

// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form data
    if (/* validation fails */) {
        // Store form data in session
        $_SESSION['form_data'] = $_POST;
        
        // Redirect back to the form page
        header("Location: form.php");
        exit();
    } else {
        // Process the form data
        // Clear the form data from session
        unset($_SESSION['form_data']);
    }
}

// Display the form with errors if any
if (isset($_SESSION['form_data'])) {
    $form_data = $_SESSION['form_data'];
    unset($_SESSION['form_data']);
} else {
    $form_data = [];
}
?>
```
This code snippet demonstrates how to store form data in sessions if there are errors during form submission and return to the form with the data intact.

Keywords

form data errors handling PHP sessions intact data

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