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/**
 * Format a field item for display.
 *
 * @param $field
 *   Either a field array or the name of the field.
 * @param $item
 *   The field item to be formatted (such as $node->field_foo[0]).
 * @param $formatter
 *   The name of the formatter to use.
 * @param $node
 *   Optionally, the containing node object for context purposes.
 *
 * @return
 *   A string containing the contents of the field item sanitized for display.
 *   It will have been passed through the necessary check_plain() or check_markup()
 *   functions as necessary.
 */
function content_format($field, $item, $formatter = 'default', $node = NULL) {
  if (!is_array($field)) {
    $field = content_fields($field);
  }
  $field_types = _content_field_types();
  $formatters = $field_types[$field['type']]['formatters'];

  if (!isset($formatter, $formatters)) {
    $formatter = 'default';
  }
  return module_invoke($formatters[$formatter]['module'], 'field_formatter', $field, $item, $formatter, $node);
}