How can the appropriate superglobal variable (GET, POST, SESSION, etc.) be determined for content retrieval in PHP?

To determine the appropriate superglobal variable for content retrieval in PHP, you need to consider the method used to send the data. If the data was sent via a form using the POST method, you should use the $_POST superglobal. If the data was sent via the URL using the GET method, you should use the $_GET superglobal. If the data is stored in a session variable, you should use the $_SESSION superglobal. 

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Data sent via POST method
    $data = $_POST['data'];
} elseif ($_SERVER["REQUEST_METHOD"] == "GET") {
    // Data sent via GET method
    $data = $_GET['data'];
} elseif (isset($_SESSION['data'])) {
    // Data stored in a session variable
    $data = $_SESSION['data'];
}

Keywords

superglobal variables GET POST SESSION content retrieval PHP

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