How do you write login and logout code in php?

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Have a session_start(); at the very top of the page in php like this:
<?php
session_start();
?>

Then write a login form:
<form action="login.php" method = "POST">
<input type = "text" name = "username">
<input type = "password" name = "password">
<input type = "submit" value = "submit">
</form>

now start a new page called login.php. Put session_start(); at the top of the page again. Now you'll have two different $_POST variables from the form that got submitted. It's $_POST['username'] and $_POST['password']. the "name" of the input is what the $_POST variable is. And it's a $_POST because of the method of the form. Now you should change the names of the $_POST just to make it easier.
<?php
$username = $_POST['username'];
$password = $_POST['password'];
?>

Now it's time to see if that username and password are in the database

<?php
$mysql = "SELECT COUNT(*) FROM users WHERE username = '$username' AND password = '$password'"; // Select statement to find user
$query = mysql_query($mysql); // Query to see if user exists
$result = mysql_query($query); // Result for query. Should be either 1 or 0.

if ($result != 1)
{
?>
<script>
alert ("That username or password doesn't exist");
</script>
<meta http-equiv="refresh" content = "1; URL = index.php">
<?php // Javascript alert saying that username or password was wrong then loading the page back to the main page.
}
else
{
$_SESSION['username'] = $username; // Setting the variable for the username so now you can use $_SESSION['username'] anywhere on your website to display who is logged in.
}
?>

You have to put session_start(); at the top of every webpage though. Now for the logout. Create a page called logout.php. You can link to this page however you'd like. All you need for this page is:
<?php

session_destroy(); //destroys the current session
<meta http-equiv="refresh" content = "1; URL = index.php"> //Reloads the page back to the index.php
?>
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