original_string: public function pdo(PDO $pdo = null)
      {
          if ($pdo) {
              $this->pdo = $pdo;
          }
  
          return $this->pdo;
      }
code: public function pdo(PDO $pdo = null)
      {
          if ($pdo) {
              $this->pdo = $pdo;
          }
  
          return $this->pdo;
      }
code_tokens: public function pdo ( PDO $ pdo = null ) { if ( $ pdo ) { $ this -> pdo = $ pdo ; } return $ this -> pdo ; }
docstring: Get or set PDO instance
  
  @param PDO $pdo (optional)
  @return PDO
docstring_tokens: Get or set PDO instance