How do I get the username of the logged-in user?

Question

I am working on a site where on a page I am querying some data related to my project.

Here I have many clients and I have given all of them access to project search page. On search page I run a query according to the fields selected by the user and display the result as a table on the page itself. But my query is as such that it is not user dependent.

I just want to ensure that each user has a specific set of output for itself (i.e not all the table would be displayed to all users).

How do I get the username or user ID of the logged-in user?

Answer 1

You can use the global $user object:

An object representing the user currently visiting the site.

Contains preferences and other account information for logged-in users. When a user is not logged-in, the $user->uid property is set to 0.

e.g.

global $user;
$name = $user->name;
$id = $user->uid;

// or
$name = $GLOBALS['user']->name;
$id = $GLOBALS['user']->uid;

Answer 2

You can use:

   global $user;      
   if (!empty($user->uid))
   {$id = $user->uid;} //$id will only have a value if user is logged in