How can I check if the author of the current node is the current logged in user?

Question

I am trying to execute a Rule based on the condition of whether the currently logged in user, is currently viewing their node (a node they are the author of), or viewing someone else's node. The Rule event/trigger I am using is "User saves a Status" from Statuses module. Next I have used the Rules condition "Execute Custom PHP code", and set an if statement that checks whether the current node uid (the uid of the node's author) equals the current user uid:

if ($node->uid == $user->uid) {
  return TRUE;
}
else {
  return FALSE;
}

This is causing a bunch of "Trying to get property of non-object" errors, as both the $node and $user variables are not being recognised. I'm not sure why this is the case, do I need to use the node_load() and user_load() functions before using these variables? If so how?

Answer 1

I have managed to work it out! Below is the code for checking whether the current user is viewing content they are an author of:

global $user;
if (arg(0) == 'node' && is_numeric(arg(1))) {
  // Get the nid
  $nid = arg(1);

  // Load the node if you need to
  $node = node_load($nid);
}

if($node->uid == $user->uid){
return TRUE;
} else {
return FALSE;
}

Hope this is helpful to someone.

Answer 2

You don't need to write any PHP code to achive that.

1. Create a new rule
2. React on event: Content is viewed (under Node section)
3. Add condition: Data comparison (under Data section). Continue.
4. Data to compare, data selector: node:author. Continue.
5. Data value, data selector: site:current-user. Save.

UPDATE:

According to you latest edit, my above answer becomes invalid. As I already written in comments, I am not sure if $node object is loaded in your script, however I am almost sure that the $user object is not. You can load the currently logged in user adding:

global $user;

at the beginning of you code block. Since I never used PHP in UI, I am not sure if there are tokens available to use. Look around the UI to find out this information, and if they are available, try to make use of them in your code.

Answer 3

I have a little bit of a different method. It's very similar to FrontEnd's method, but I try to stay away from arg() as much as possible (for better or worse). It uses menu_get_object() so this won't work in D8, but I've not moved into D8 yet for anything I'm doing.

Here she is:

global $user;
// Logged in user
$uid = $user->uid;

$node = menu_get_object();
if (!empty($node)) {
  // Node creator ID
  $nuid = $node->uid;
}

if ($uid==$nuid) {
  $creator = TRUE;
} else {
  $creator = FALSE;
}

Then, if I need to display specific information to the content creator I just use:

if ($creator) {
  // Hello Creator
}

Now I've got uid of the logged in user and the content creator to use further down the function as well.