how to identify when a user is viewing their profile?

Question

I'm relatively new to Drupal and have created a module that among other things uses hook_menu() to add a link to a user navigation "my gallery" this all works well except this link appears when a user views another user's profile. So what i want to do is add some code to tell Drupal not to display this link when a user is not on their own profile.

I'm guessing I need to change the access callback from user_access to a custom callback that carries out this check. Any help would be greatly appreicated.

EDIT my code so far is

global $user;
    //get name of current user
    $currentUser = $user->uid;
    //get profile url
    $profileUrl = arg(1);
    // compare usernames to determine whether the user is on their own profile.
    if($currentUser == $profileUrl)
    {
        //user is on their profile, display link
        $profileUrl = "i'm home";
    }
    else
    {
        $profileUrl = "away";
    }
    $items['user/%user/gallery'] = array(
        'title'            => $profileUrl
       ,'page callback'    => 'drupal_goto'
       ,'page arguments'   => array('gallery')
       ,'access callback'  => 'user_access'
       ,'access arguments' => array('access content')
       ,'type'             => MENU_LOCAL_TASK
    );    
    return $items;

The problem is it seems to get fixated, so if i start on the admin profile it correctly displays i'm home, however if i view another profile this doesn't change as it should. ANy ideas?

EDIT 2 Thanks mohit_rocks, your idea of using the title callback helped me get to the answer. For those interested I set up an access callback to perform the check dynamically.

Answer 1

You can try 'title callback' attribute of hook_menu function.

$items['user/%user/gallery'] = array(
       'title callback' => 'get_title',
       'title arguments' => array(1),
       'page callback'    => 'drupal_goto',
       'page arguments'   => array('gallery'),
       'access callback'  => 'user_access',
       'access arguments' => array('access content'),
       'type'             => MENU_LOCAL_TASK,
    );    

And now you can call the function

function get_title($user_id) {
    global $user;
    $currentUser = $user->uid;
    //get profile url for that you can use $user_id as user id
    $profileUrl = arg(1);
    // compare usernames to determine whether the user is on their own profile.
    if($currentUser == $profileUrl)
    {
        //user is on their profile, display link
        $profileUrl = "i'm home";
    }
    else
    {
        $profileUrl = "away";
    }
    return $prifileURL;
}

Answer 2

You can use

hook_user_view

The user's account information is being displayed.

The module should format its custom additions for display and add them to the $account->content array.

e.g

function MYMODULE_user_view($account, $view_mode, $langcode) {
  global $user;
  // Check if logged in user id matches viewed user account
  if ($user->uid == $account->uid)) {
    $account->content['summary']['gallery'] =  array(
      '#type' => 'user_profile_item', 
      '#title' => t('My gallery'), 
      '#markup' => $gallery,  // TODO, get account gallery markup
      '#attributes' => array('class' => array('my-gallery')),
    );
  }
}