$username='jellybool';
$password='jellybool.com';
echo "简单地对字符串进行md5加密";
echo "
";
echo $username;
echo "
";
echo md5($username);
echo "
";
echo $password;
echo "
";
echo md5($password);
echo "
";
echo "更推荐的做法是对重要的敏感数据进行多次加密，以防被轻易破解";
echo "
";
echo $password;
echo "
";
echo md5(md5($password));
?>
