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<?php $pdo = 'PDO'; $stmt = 'PDOStatement'; var_dump($pdo); var_dump($stmt); $pdo && $stmt = null; var_dump($pdo); var_dump($stmt);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(3) "PDO" string(12) "PDOStatement" string(3) "PDO" NULL