Session full Tutorial (iii)

Third, the session application example

The following example fragments are for reference only, you can customize or not customize the session, as you would
(1) for user authentication
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Session_Start ();
$DBH =mysql_connect ("localhost:3306", "xxxx", "xxxx");
mysql_select_db ("Znsoft");//Select Database
$query = "selectuseridfromreguserwhereuserid= ' $userid ' andpass= ' $pass '";
$userid $pass is the username and password that the login form passes over
$res =mysql_query ($query, $DBH);
if ($row =mysql_fetch ($res))
{
$reguser = $row [0];
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<script>
Alert ("OK, buddy, welcome you!");
</script>
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}
Else
{
$reguser = "";
?>
<script>
Alert ("Sorry, you are not a registered user!");
</script>
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You put the code on yourself.
}
Session_register ("Reguser");
?>
Check to see if you're logged on in another page
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Session_Start ();

if (Isset ($reguser) && $reguser!= "")//already logged in
{
echo "Welcome you, Buddy";
}
else//didn't log in!
echo "Please sign up";
?>
Exit function
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Session_destroy ();
or $reguser= "";
?>

(2) for passing variables

This program is used to pass variables between pages
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$name = "M.y";
if (!sesion_is_registered ("name"))//does not register session variable name
Session_register ("name");//Register variable name
?>
Second page
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Echo$name;

Don't want to use it, erase it
if (session_is_registered ("name"))//is registered if it has been registered
Session_unregister ("name");
?>