Different size user pictures (avatars) in different pages

A while back, we need to do display different sized user pictures (avatars) in Drupal 5.x on a client site. They wanted the user picture on the user profile page to be 100x100 pixels, but be displayed only as 65x65 on blog comments.

This is fairly easily achieved by creating this function in template.php. This function creates 65x65 size images from the original 100x100, and takes an argument of size so either can be used in different places.

function phptemplate_user_picture($account, $size = '65x65') {
  if (!variable_get('user_pictures', 0))  {
    return '';
  }

  // Default to a certain size
  if (arg(0) == 'user' && is_numeric(arg(1))) {
    $size = '100x100';
  }

  if ($account->picture && file_exists($account->picture)) {
    switch($size) {
      case '100x100':
        $maxsize_icon = array('w'=> 100, 'h'=> 100);
        $info = image_get_info($account->picture);
        if ($info['height'] picture) . '/picture-' 
         . $account->uid . '.' . $info['extension'];
        if (!file_exists($newpicture) || 
          (filectime($newpicture) picture))) {
          image_scale($account->picture, $newpicture, $maxsize_icon['w'],
            $maxsize_icon['h']);
        }
        $picture = file_create_url($newpicture);
        break;

      case '65x65':
        $maxsize_tile = array('w'=> 65, 'h'=> 65);
        $info = image_get_info($account->picture);
        $newpicture = dirname($account->picture) . '/picture-' 
          . $account->uid . '-small' . '.' . $info['extension'];
        if (!file_exists($newpicture) || 
          (filectime($newpicture) picture))) {
          image_scale($account->picture, $newpicture, $newpicture, 
            $maxsize_tile['w'], $maxsize_tile['h']);
        }
        $picture = file_create_url($newpicture);
        break;

      default:
        $picture = file_create_url($account->picture);
        break;
    }
  }
  else {
    $picture = variable_get('user_picture_default', '');
  }

  if (isset($picture)) {
    $alt = t('@user\'s picture', 
      array('@user' => $account->name ? $account->name : 
        variable_get('anonymous', 'Anonymous')));
    $picture = theme('image', $picture, $alt, $alt, '', false);
    if (!empty($account->uid) && user_access('access user profiles')) {
      $picture = l($picture, "user/$account->uid", array('html' => TRUE));
    }

    return $picture;
  }
}

Once you have that in the theme, you can select the small size like this:

<?php if ($picture) { print theme('user_picture', $node, '65x65'); }?> 

Or the normal size like this:

<div class="picture"><?php print theme('user_picture', $user, '100x100'); ?></div>

Now, all you need to do is select the size you want in the various places you need to display the user picture.