original_string: public function traceAt($levels, $replace = false)
      {
          $prev = $this->tracedErrors;
          $this->tracedErrors = (int) $levels;
          if (!$replace) {
              $this->tracedErrors |= $prev;
          }
  
          return $prev;
      }
code: public function traceAt($levels, $replace = false)
      {
          $prev = $this->tracedErrors;
          $this->tracedErrors = (int) $levels;
          if (!$replace) {
              $this->tracedErrors |= $prev;
          }
  
          return $prev;
      }
code_tokens: public function traceAt ( $ levels , $ replace = false ) { $ prev = $ this -> tracedErrors ; $ this -> tracedErrors = ( int ) $ levels ; if ( ! $ replace ) { $ this -> tracedErrors |= $ prev ; } return $ prev ; }
docstring: Sets the PHP error levels for which the stack trace is preserved.
  
  @param int  $levels  A bit field of E_* constants for traced errors
  @param bool $replace Replace or amend the previous value
  
  @return int The previous value
docstring_tokens: Sets the PHP error levels for which the stack trace is preserved .