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<?php echo (now())->format('Y-m-d H:i:s');
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 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
Fatal error: Uncaught Error: Call to undefined function now() in /in/HkPq5:2 Stack trace: #0 {main} thrown in /in/HkPq5 on line 2
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR), expecting ',' or ';' in /in/HkPq5 on line 2
Process exited with code 255.

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