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<?php $arr = ["a"=>[],"b"=>new class{}]; var_dump(json_encode($arr));
Output for 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
string(15) "{"a":[],"b":{}}"
Output for 5.6.38
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/VHTYq on line 3
Process exited with code 255.
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70.64 ms | 406 KiB | 5 Q