original_string: public function skip_whitespace()
  	{
  		$whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position);
  		$this->position += $whitespace;
  		return $whitespace;
  	}
code: public function skip_whitespace()
  	{
  		$whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position);
  		$this->position += $whitespace;
  		return $whitespace;
  	}
code_tokens: public function skip_whitespace ( ) { $ whitespace = strspn ( $ this -> data , "\x09\x0A\x0D\x20" , $ this -> position ) ; $ this -> position += $ whitespace ; return $ whitespace ; }
docstring: Advance past any whitespace
  
  @return int Number of whitespace characters passed
docstring_tokens: Advance past any whitespace