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<?php $x = null; var_dump(1 instanceof $x);
Output for 7.3.16 - 7.3.33, 7.4.3 - 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
bool(false)
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.30, 5.6.8 - 5.6.14, 7.2.29 - 7.2.33
Fatal error: instanceof expects an object instance, constant given in /in/Isnqc on line 5
Process exited with code 255.

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