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<?php	define('DB_HOST', 'localhost');    define('DB_USER', 'jatinder');    define('DB_PASSWORD', 'mypassword');    define('DB_DATABASE', 'mydatabase');?>                                  

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THe question is , Because users can access my mysql database and at
the same time he can modifiy or change other users' information such as password
and login name besides himself. Is it Dangerours ? How to let the users only
can change his login information only and not to accesss others' information , please advise ?

Question-2 I have two different computers but users can login the form with the same login and same passwork.
How to avoid double same username login at different computers ? Do i  need to write some php code to record
the status of users login  saving  into the mysql data when they are doing login and logout from the form.  
Could you provide me some coding ?

Qestioon-3  Once the login success after login username is matching its password in the database
, the php code  in login-exec.php will create php session variables to store members' id, firstname, lastname
like as follows

$_SESSION['SESS_MEMBER_ID'] = $member['member_id'];"
$_SESSION['SESS_FIRST_NAME'] = $member['firstname'];"
$_SESSION['SESS_LAST_NAME'] = $member['lastname'];"

In auth.php which will be used for every website page for user authority checking and it will check
the session variable whether it is  set or not.
The question is whether the session variables are saved in the my server instead of user computer ?
If so, is it dangerous because other users might be also doing the login form submitting  at the same so the
variable is set even some users is NOT doing any login  and they access the web page without login?

<"?php   //auth.ph	//Start session	session_start();"	//Check whether the session variable SESS_MEMBER_ID is present or not	if(!isset($_SESSION['SESS_MEMBER_ID']) || (trim($_SESSION['SESS_MEMBER_ID']) == '')) {		header("location: access-denied.php");"		exit();"	}?>"                                  

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