Online PHP editor | output for kAVJ9

<?php // Scenario 1 $preferred_icon = 'test'; $plugin_data = null; var_dump( ! empty( $plugin_data->update->icons[ $preferred_icon ] ) ); // Scenario 2 $plugin_data = new stdClass(); $plugin_data->update = new stdClass(); $plugin_data->update->icons = null; var_dump( ! empty( $plugin_data->update->icons[ $preferred_icon ] ) ); // Now try it without the `empty()`. // Scenario 3 var_dump( $plugin_data->update->icons[ $preferred_icon ] ); // Scenario 5 $plugin_data = new stdClass(); $plugin_data->update = new stdClass(); var_dump( $plugin_data->update->icons[ $preferred_icon ] );