How to keep user info in Session

I am trying to make a login system for my site. I am kind of stucked. How can i save wheither the user logged in or not to session?

This is my code

<?php 
		
		mysql_connect("localhost", "user", "password") or die(mysql_error());
		mysql_select_db("DBName") or die(mysql_error());
			
		if(isset($_POST['email']) && isset($_POST['password'])){
			// Verify
			$email = mysql_escape_string($_POST['email']);
			$password = md5($_POST['password']);
			
			$gUser = mysql_query("SELECT * FROM users WHERE email='".$email."' AND password='".$password."' LIMIT 1") or die(mysql_error());
			$verify = mysql_num_rows($gUser);
			
			if($verify > 0){
			
				echo '<h2>Login Complete</h2>
				      <p>Click here to download our program</p>';
			}else{
				echo '<h2>Login Failed</h2>
				      <p>Sorry your login credentials are incorrect.';
			}
		}else{
		?>
		<h2>Login</h2>
		<p>Please enter your login credentials to get access to the download area</p>
		
		<form method="post" action="">
			<fieldset>
				<label for="email">Email:</label><input type="text" name="email" value="" />
				<label for="password">Password:</label><input type="text" name="password" value="" />
				<input type="submit" value="Login" />
			</fieldset>
		</form>
		
		<?php
		}
		?>

PHP:

 

Do you have some kind of user id field in the users table?

you can use a mysql_fetch_array(), to get the userid from the query already, then store it in a session eg.
$_SESSION['userid'] = $row['userid'];

then, use the isset() function to check if the user is logged in. And just use the unset() function for the user logout part.

 

Thank you. It is sorted. I did not think it would be that easy