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<?php $db = new stdClass; $db->affected_rows = 1; //affected_rows is type int echo '$db->affected_rows '; var_dump($db->affected_rows); echo 'empty($db->affected_rows) '; var_dump(empty($db->affected_rows)); echo '$db->affected_rows > 0 '; var_dump($db->affected_rows > 0);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
$db->affected_rows int(1) empty($db->affected_rows) bool(false) $db->affected_rows > 0 bool(true)

preferences:
207.54 ms | 405 KiB | 308 Q