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One of my client always like to sent mail to his members with updates of the website to make them participate. For long time he was demanded me a auto login system in joomla.

Today at last we got the solution how we can do it. I am sharing this with you hope that may help a lot of people.

function FnAutoLogin($ActivateID)
{

global $mainframe;
$db = JFactory::getDBO();
$Password =  FnGenerateNewPassword(’9′); // Generating joomla password

//Fetching User Details according to Activation ID start

$query = “select * from #__users where activation=’”.$ActivateID.”‘”;
$db->setQuery( $query );
$UserDetailsInArray = $db->loadObjectList();

//Fetching User Details according to Activation ID end

if(isset($UserDetailsInArray[0]))
{
$TempPassword = $UserDetailsInArray[0]->password;   // Storing user actual password

$query1 = “update #__users set password=’”.$Password.”‘ where activation =’”.$id.”‘”; //Updating temporary password
$db->setQuery( $query1 );
if($db->query())
{
//                      User Login start

$usersipass[’username’] = $UserDetailsInArray[0]->username;
$usersipass[’password’] = ‘9′;
$mainframe->login($usersipass);

//                      User Login end
$query1 = “update #__users set password=’”.$TempPassword.”‘, block=0 where activation =’”.$ActivateID.”‘”; //Update user actual password againand redirect to your appropriate page you like
$db->setQuery( $query1 );
if($db->query())
{
$Msg = ‘Please upload your picture to see your profile.’;
$mainframe->redirect( ‘index.html’,$Msg);
}
}
}
else
{
echo ‘You don\’t have account yet? <a href=”/join.html”>Join Us Today </a>’;
}
}

Hope this will help a lot of developer to make auto login system in joomla.