February 12, 2011 
Definition:
function is_super_admin( $user_id = false ) {}
Determine if user is a site admin.
Parameters
- int $user_id: (Optional) The ID of a user. Defaults to the current user.
Return values
returns:True if the user is a site admin.
Source code
function is_super_admin( $user_id = false ) {
if ( $user_id )
$user = new WP_User( $user_id );
else
$user = wp_get_current_user();
if ( empty( $user->ID ) )
return false;
if ( is_multisite() ) {
$super_admins = get_super_admins();
if ( is_array( $super_admins ) && in_array( $user->user_login, $super_admins ) )
return true;
} else {
if ( $user->has_cap('delete_users') )
return true;
}
return false;
}
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