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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 - 7.1.7, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
$db->affected_rowsint(1) empty($db->affected_rows)bool(false) $db->affected_rows > 0bool(true)

preferences:
205.41 ms | 406 KiB | 310 Q