如何将会话保存到mysql中？

CREATE TABLE sessions (
    id CHAR(32) NOT NULL,
    data TEXT NOT NULL,
    expires INT(11) UNSIGNED NOT NULL,
    PRIMARY KEY (id)
);

sudo apt-get install php-mysql

session.save_handler = pdo_mysql
session.save_path = "mysql:host=localhost;dbname=your_database;charset=utf8"
session.save_handler_user = your_username
session.save_handler_password = your_password

<?php
session_start();

if (!isset($_SESSION['count'])) {
    $_SESSION['count'] = 0;
} else {
    $_SESSION['count']++;
}

echo "您已访问此页面 " . $_SESSION['count'] . " 次。";
?>

SELECT * FROM sessions;