require "app/Mage.php";
umask(0);
Mage::app();
$collection = Mage::getModel('log/visitor_online')->prepare()->getCollection();

//Get all the customers that are logged in......
foreach($collection->getData() as $cust) {
        echo 'Customer ID: '.$cust['customer_id'] . '<br/>';
        echo 'Last URL visited: '.$cust['last_url'] . '<br/>';
        echo 'First visit: '.$cust['first_visit_at'] . '<br/>';
        echo 'Last visit: '.$cust['last_visit_at'] . '<br/>';
        echo '======================<br/>';
}

//Get any particular customer, if he's currently logged in or not.....
$collection->addFieldToFilter('customer_id', 5)->addCustomerData(); //5 is customer ID of customer you want to check
if($collection->count()) {
	echo 'Customer is logged in';
} else {
	echo 'Customer is NOT logged in';
}

http://ka.lpe.sh/2013/04/25/magento-check-if-any-particular-customer-is-currently-logged-in/

- Check if any particular customer is currently logged in or not.
- Get all the logged in customers with their recent activity.
- Courtsey: <a href="http://ka.lpe.sh">http://ka.lpe.sh</a>

Check if any particular customer is logged in or not

magento

PHP