Online PHP editor | refs for gNqXR

<?php $data = 'here\'s some data'; var_dump(isset($data['string'])); var_dump(isset($data['string'][0])); var_dump(isset($data[0][0])); var_dump(isset($data[0][0][0])); var_dump(isset($data[10][222][555])); var_dump(isset($data[1])); var_dump(isset($data[1][0]));