original_string: protected function removeExtraKeys()
      {
          foreach ($this->extraKeys as $offset => $value) {
              if ($this->data[$offset] === null) {
                  unset($this->data[$offset]);
              }
          }
          $this->extraKeys = [];
      }
code: protected function removeExtraKeys()
      {
          foreach ($this->extraKeys as $offset => $value) {
              if ($this->data[$offset] === null) {
                  unset($this->data[$offset]);
              }
          }
          $this->extraKeys = [];
      }
code_tokens: protected function removeExtraKeys ( ) { foreach ( $ this -> extraKeys as $ offset => $ value ) { if ( $ this -> data [ $ offset ] === null ) { unset ( $ this -> data [ $ offset ] ) ; } } $ this -> extraKeys = [ ] ; }
docstring: Removes extra keys in data
docstring_tokens: Removes extra keys in data