original_string: public function isHeaderSent(&$file = null, &$line = null)
      {
          return $this->unitTest ? (bool)$this->sentHeaders : headers_sent($file, $line);
      }
code: public function isHeaderSent(&$file = null, &$line = null)
      {
          return $this->unitTest ? (bool)$this->sentHeaders : headers_sent($file, $line);
      }
code_tokens: public function isHeaderSent ( & $ file = null , & $ line = null ) { return $ this -> unitTest ? ( bool ) $ this -> sentHeaders : headers_sent ( $ file , $ line ) ; }
docstring: Checks if or where headers have been sent
  
  If NOT in unit test mode and the optional `file` and `line` parameters
  are set, `isHeaderSent()` will put the PHP source file name and line
  number where output started in the file and line variables
  
  @param string $file
  @param int $line The line number where the output started
  @return bool
  @link http://php.net/manual/en/function.headers-sent.php
docstring_tokens: Checks if or where headers have been sent