How to easily determine whether a user is logged in in Joomla

The example in this article describes how Joomla simply determines whether the user is logged in. Share it with everyone for your reference, the details are as follows:

<&#63;php
if (isset($_SESSION['auth']["username"]))
{ echo "Welcome <a href='index.php&#63;option=com_user&view=user&task=edit'>" . $_SESSION['auth']["username"] . "</a>!"; }
else
{ echo "<a href='index.php&#63;option=com_user&view=login'>Log in</a>"; }
?>

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I hope this article will be helpful to everyone when designing programs based on Joomla.

The above introduces Joomla's simple method to determine whether the user is logged in, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.