original_string: public function get_transaction_start_backtrace() {
          if (!$this->transactions) {
              return null;
          }
          $lowesttransaction = end($this->transactions);
          return $lowesttransaction->get_backtrace();
      }
code: public function get_transaction_start_backtrace() {
          if (!$this->transactions) {
              return null;
          }
          $lowesttransaction = end($this->transactions);
          return $lowesttransaction->get_backtrace();
      }
code_tokens: public function get_transaction_start_backtrace ( ) { if ( ! $ this -> transactions ) { return null ; } $ lowesttransaction = end ( $ this -> transactions ) ; return $ lowesttransaction -> get_backtrace ( ) ; }
docstring: Returns transaction trace for debugging purposes.
  @private to be used by core only
  @return array or null if not in transaction.
docstring_tokens: Returns transaction trace for debugging purposes .