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<?php class MyPDO extends PDO { function __construct() {} } $pdo = new MyPDO(); $pdo2 = clone $pdo; $pdo2->query("123");
Output for 5.2.3, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0

Process exited with code 139.
Output for 5.3.0 - 5.6.28
Warning: PDO::query(): SQLSTATE[HY000]: General error: constructor arguments must be passed as an array in /in/aQ2E4 on line 6 Warning: PDO::query(): SQLSTATE[HY000]: General error: failed to instantiate user supplied statement class in /in/aQ2E4 on line 6
Output for 5.2.4 - 5.2.17
Warning: PDO::query(): SQLSTATE[HY000]: General error: constructor arguments must be passed as an array in /in/aQ2E4 on line 6 Warning: PDO::query(): SQLSTATE[HY000]: General error: failed to instantiate user supplied statement class in /in/aQ2E4 on line 6
Process exited with code 139.
Output for 5.1.5, 5.2.0 - 5.2.2
Warning: PDO::query(): SQLSTATE[00000]: No error: PDO constructor was not called in /in/aQ2E4 on line 6
Output for 5.1.0 - 5.1.4, 5.1.6
Warning: PDO::query(): SQLSTATE[00000]: No error: PDO constructor was not called in /in/aQ2E4 on line 6
Process exited with code 139.
Output for 5.0.0 - 5.0.5
Fatal error: Class 'PDO' not found in /in/aQ2E4 on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_VARIABLE in /in/aQ2E4 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_VARIABLE in /in/aQ2E4 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/aQ2E4 on line 5
Process exited with code 255.