original_string: public function Sum( $Func = null )
  	{
  		$items = $this->Select( $Func );
  		$sum   = 0;
  
  		foreach ( $items as $item ) $sum += $item;
  
  		return $sum;
  	}
code: public function Sum( $Func = null )
  	{
  		$items = $this->Select( $Func );
  		$sum   = 0;
  
  		foreach ( $items as $item ) $sum += $item;
  
  		return $sum;
  	}
code_tokens: public function Sum ( $ Func = null ) { $ items = $ this -> Select ( $ Func ) ; $ sum = 0 ; foreach ( $ items as $ item ) $ sum += $ item ; return $ sum ; }
docstring: Get sum of sequence
  
  @param string|Closure $Func
  @return double
docstring_tokens: Get sum of sequence