What are the advantages and disadvantages of using MySQL tables for storing session IDs in PHP?

Storing session IDs in MySQL tables can provide better security and scalability compared to storing them in files. However, it can introduce some performance overhead due to database queries for each session operation. 

// Connect to MySQL database
$mysqli = new mysqli("localhost", "username", "password", "database");

// Set custom session save handler
function open($savePath, $sessionName) {
    return true;
}

function close() {
    return true;
}

function read($id) {
    global $mysqli;
    $result = $mysqli->query("SELECT data FROM sessions WHERE id = '$id'");
    $row = $result->fetch_assoc();
    return $row['data'];
}

function write($id, $data) {
    global $mysqli;
    $data = $mysqli->real_escape_string($data);
    $result = $mysqli->query("REPLACE INTO sessions (id, data) VALUES ('$id', '$data')");
    return $result;
}

function destroy($id) {
    global $mysqli;
    $result = $mysqli->query("DELETE FROM sessions WHERE id = '$id'");
    return $result;
}

function gc($maxLifetime) {
    global $mysqli;
    $result = $mysqli->query("DELETE FROM sessions WHERE TIMESTAMP < (NOW() - INTERVAL $maxLifetime SECOND)");
    return $result;
}

session_set_save_handler('open', 'close', 'read', 'write', 'destroy', 'gc');

// Start the session
session_start();

Keywords

MySQL session IDs PHP advantages disadvantages

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