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add_filter('widget_text', 'enable_php_code', 99);

function enable_php_code ($text)
{
  if (strpos($text, '<' . '?') !== false) 
  {
    ob_start();
    eval('?' . '>' . $text);
    $text = ob_get_contents();
    ob_end_clean();
  }

  return $text;
}