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When making a registration you want field that havve $_POST['get']; Variables assigned to them! these then go into the database and when you make a login it simply goes

SELECT FROM TABLE `users` WHERE USERNAME=$_POST['username'] AND PASSWORD=$_POST['password']; Then it takes that data. Sees if the SQL is correct and if so looks for the datafield containing that Query and if it finds it then it registers a Session Super Gglobal. allowing you to do stuff. Then say your superglobal is called $valid_user (Which is the global I always use) then it registers it and later sees if it is registered like:

 

<?php
$valid_user = $_SESSION['valid_user'];
if (session_is_registered('valid_user')){
echo 'You Are logged in As' . $valid_user . '';
}
?>

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