Single sign on php script

<?php
$MySecretKey = 'Nobody Will Ever Guess This!!';

// Generate signature from authentication info + secret key
$sig = hash(
    'sha256',
     $user->id . $user->email,
     $MySecretKey
);

// Make sure we're redirecting somewhere safe
$source = parse_url($_GET['source']);
if(in_array($source->host, $list_of_safe_hosts))
  $target = 'http://'.$source->host.$source->path;

// Send the authenticated user back to the originating site
header('Location: '.$target.'?'.
    'user_id='.$user->id.
    '&user_email='.urlencode($user->email).
    '&sig='.$sig);
?>

Source: stackoverflow.com

Single sign on php script

<a href='http://login.example.com/login.php?source=my.other.site.com/foo/bar'>log in!!</a>

Source: stackoverflow.com

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