Online PHP editor | output for EdcWs

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