$this->assertFalse(isset($data->{0}));
$this->assertFalse(isset($data[0]));
foreach ($data as $k => $v) {
$this->assertTrue(isset($data->{$k}));
$this->assertTrue(isset($data[$k]));
$this->assertFalse(isset($data->{0}));
$this->assertFalse(isset($data[0]));
foreach ($data as $k => $v) {
$this->assertTrue(isset($data->{$k}));
$this->assertTrue(isset($data[$k]));