Как удалить дубли строк?

$file_read = explode("\r\n", file_get_contents($this->path));

      $elCounts = array_count_values($file_read);
      $result = array();
      for ($i = 0; $i < count($file_read); ++$i) {
        foreach ($elCounts as $k => $v) {
          if ($file_read[$i] == $k && $v == 1) {
            $result[] = $file_read[$i];
            break;
          }
        }
      }

$elCounts = array_count_values($file_read);
$result = array();
foreach($file_read as $line) {
    if ($elCounts[$line] === 1) {    
        $result[] = $line;
    }
}