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<?php class Foo { } $cache = new Foo(); isset($cache['foo']['bar']);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Fatal error: Uncaught Error: Cannot use object of type Foo as array in /in/oPMeC:10 Stack trace: #0 {main} thrown in /in/oPMeC on line 10
Process exited with code 255.

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