JBZoo\Data\Data::offsetGet PHP Method

    public function offsetGet($index)
    {
        if (!array_key_exists($index, $this)) {
            return null;
        }
        return parent::offsetGet($index);
    }

 public function testGetUndefined()
 {
     $array = $this->_data;
     $data = new Data($this->_data);
     $arrobj = new \ArrayObject($this->_data);
     $arrobjExt = new \ArrayObjectExt($this->_data);
     Benchmark::compare(array('array::@' => function () use($array) {
         return @$array['undefined'];
     }, 'array::isset' => function () use($array) {
         return isset($array['undefined']) ? $array['undefined'] : null;
     }, 'array::array_key_exists' => function () use($array) {
         return array_key_exists('undefined', $array) ? $array['undefined'] : null;
     }, 'ArrayObject::arrow@' => function () use($arrobj) {
         return @$arrobj->undefined;
     }, 'ArrayObject::array@' => function () use($arrobj) {
         return @$arrobj['undefined'];
     }, 'ArrayObject::offsetGet@' => function () use($arrobj) {
         return @$arrobj->offsetGet('undefined');
     }, 'ArrayObjectExt::arrow@' => function () use($arrobjExt) {
         return @$arrobjExt->undefined;
     }, 'ArrayObjectExt::array@' => function () use($arrobjExt) {
         return @$arrobjExt['undefined'];
     }, 'ArrayObjectExt::offsetGet@' => function () use($arrobjExt) {
         return @$arrobjExt->offsetGet('undefined');
     }, 'Data::get' => function () use($data) {
         return $data->get('undefined');
     }, 'Data::arrow@' => function () use($data) {
         return @$data->undefined;
     }, 'Data::array@' => function () use($data) {
         return @$data['undefined'];
     }, 'Data::find' => function () use($data) {
         return $data->find('undefined');
     }, 'Data::offsetGet@' => function () use($data) {
         return @$data->offsetGet('undefined');
     }), array('name' => 'Get undefined var', 'count' => 10000));
 }