original_string: public function add($key, $element)
      {
          if ($this->has($key) === false) {
              $this->set($key, $element);
          }
      }
code: public function add($key, $element)
      {
          if ($this->has($key) === false) {
              $this->set($key, $element);
          }
      }
code_tokens: public function add ( $ key , $ element ) { if ( $ this -> has ( $ key ) === false ) { $ this -> set ( $ key , $ element ) ; } }
docstring: Adds a new element in this collection.
  
  @param mixed $key     The key associated to the element
  @param mixed $element The element
docstring_tokens: Adds a new element in this collection .