How can if-else statements be used to control the storage and retrieval of form data in PHP sessions?

To control the storage and retrieval of form data in PHP sessions using if-else statements, you can check if the form data has been submitted and store it in the session if it has, or retrieve it from the session if it hasn't. This allows you to maintain the form data across multiple pages or form submissions. 

<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $_SESSION['form_data'] = $_POST;
} else {
    if(isset($_SESSION['form_data'])) {
        $formData = $_SESSION['form_data'];
        // Use $formData to populate the form fields
    }
}
?>

Keywords

PHP if-else statements form data sessions storage.

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