How can sessions be used to store variables on the server in PHP to avoid re-entering data for redirection?

Sessions can be used to store variables on the server in PHP to avoid re-entering data for redirection. This way, you can store form data in session variables before redirecting the user, and then retrieve the data from the session after the redirection to pre-fill the form fields. 

<?php
session_start();

// Store form data in session variables
$_SESSION['name'] = $_POST['name'];
$_SESSION['email'] = $_POST['email'];

// Redirect to another page
header('Location: another_page.php');
exit;
?>
```

In the `another_page.php` file, you can retrieve the stored data from the session and pre-fill the form fields:

```php
<?php
session_start();

// Pre-fill form fields with session data
$name = isset($_SESSION['name']) ? $_SESSION['name'] : '';
$email = isset($_SESSION['email']) ? $_SESSION['email'] : '';
?>

<form action="process_form.php" method="post">
    <input type="text" name="name" value="<?php echo $name; ?>">
    <input type="email" name="email" value="<?php echo $email; ?>">
    <button type="submit">Submit</button>
</form>

Keywords

sessions variables server PHP redirection

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