BuildrPHP / Collection

    /**

     * {@inheritDoc}

     */

    public function put($key, $value) {

        $this->doTypeCheck($value);

        $this->checkKeyType($key);

        $return = NULL;

        if($this->containsKey($key)) {

            $return = $this->get($key);

        }

        $this->data[$key] = $value;

        return $return;

    }

    /**

     * {@inheritDoc}

    /**

     * {@inheritDoc}

     */

    public function replace($key, $value) {

        $this->doTypeCheck($value);

        $this->checkKeyType($key);

        if($this->containsKey($key)) {

            $previousValue = $this->get($key);

            $this->data[$key] = $value;

            return $previousValue;

        }

        return NULL;

    }

    /**

     * {@inheritDoc}