Online PHP editor | output for h1ntJ

<?php $test = array(); $test['eval_none'] = ''; $test['eval_zero'] = 0; $test['eval_null'] = null; $test['eval_false'] = false; $test['eval_true'] = true; if (isset($test['eval_nonexixtent'])) var_dump('Noneexistent is set.'); if (!empty($test['eval_nonexixtent'])) var_dump('Noneexistent is not empty.'); if (isset($test['eval_none'])) var_dump('None is set.'); if (!empty($test['eval_none'])) var_dump('None is not empty.'); if (isset($test['eval_zero'])) var_dump('Zero is set.'); if (!empty($test['eval_zero'])) var_dump('Zero is not empty.'); if (isset($test['eval_null'])) var_dump('NULL is set.'); if (!empty($test['eval_null'])) var_dump('NULL is not empty.'); if (isset($test['eval_false'])) var_dump('False is set.'); if (!empty($test['eval_false'])) var_dump('False is not empty.'); if (isset($test['eval_true'])) var_dump('True is set.'); if (!empty($test['eval_true'])) var_dump('True is not empty.');