original_string: public function find($key, $default = null) {
          $key = $this->formatKey($key);
          $headers = array_get($this->headers, $key, $default);
  
          if (is_array($headers)) {
              $headers = array_pop($headers);
          }
  
          return $headers;
      }
code: public function find($key, $default = null) {
          $key = $this->formatKey($key);
          $headers = array_get($this->headers, $key, $default);
  
          if (is_array($headers)) {
              $headers = array_pop($headers);
          }
  
          return $headers;
      }
code_tokens: public function find ( $ key , $ default = null ) { $ key = $ this -> formatKey ( $ key ) ; $ headers = array_get ( $ this -> headers , $ key , $ default ) ; if ( is_array ( $ headers ) ) { $ headers = array_pop ( $ headers ) ; } return $ headers ; }
docstring: Find the last added header.
  
  @param $key
  @param null $default
  
  @return string
docstring_tokens: Find the last added header .