如果在php之后如何运行sql多行代码？

我需要在“ echo'您已成功注册，现在可以登录！”之后添加以下sql代码。我怎样才能做到这一点？

CREATE DATABASE IF NOT EXISTS $username DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci; USE $username;

CREATE TABLE IF NOT EXISTS diario ( id int(11) NOT NULL AUTO_INCREMENT, data varchar(255) NOT NULL, materia varchar(255) NOT NULL, compiti varchar(255) NOT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

INSERT INTO diario (id, data, materia, compiti) VALUES (1, '00/00/0000', 'Informatica', 'Benvenuto') if ($stmt = $con->prepare('INSERT INTO accounts (username, password, email) VALUES (?, ?, ?)')) { $password = password_hash($_POST['password'], PASSWORD_DEFAULT); $stmt->bind_param('sss', $_POST['username'], $password, $_POST['email']); $stmt->execute(); echo 'You have successfully registered, you can now login!'; }