Drupal 7, show drupal blocks only on specific pages with PHP code? [closed]

Question

I were working on drupal 7. In block configuration, under pages i went for an option "Pages on which this PHP code returns TRUE (experts only)"

Added the following code:

<?php
global $user;
$username=$user->name;
if($username=="admin")
{
   return TRUE;
}
else
{
  return FALSE;
}
?>

It's shows me an error message at the top of the screen:

Notice: Undefined property: stdClass::$name in eval() (line 3 of C:\xampp\drupal77\modules\php\php.module(75) : eval()'d code).

I don't know, how to fix it out. Please help me out.Thanks

Answer 1

How the $username variable's value will be available there? If you want to use current logged in user, write it like global $user; and check $user->name instead of $username.

Answer 2

If I get you right you want to check for the admin user.

A possible code snippet would be:

global $user;
return $user->uid==1;

Of course you can check for any property of the $user object.