<?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_none'])) var_dump('None is set.'); if (!empty($test['eval_none'])) echo 'None is not empty.\n'; if (isset($test['eval_zero'])) echo 'Zero is set.<br>'; if (!empty($test['eval_zero'])) echo 'Zero is not empty.<br>'; if (isset($test['eval_null'])) echo 'NULL is set.<br>'; if (!empty($test['eval_null'])) echo 'NULL is not empty.<br>'; if (isset($test['eval_false'])) echo 'False is set.<br>'; if (!empty($test['eval_false'])) echo 'False is not empty.<br>'; if (isset($test['eval_true'])) echo 'True is set.<br>'; if (!empty($test['eval_true'])) echo 'True is not empty.<br>';
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