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<?php $test = "null"; $test['b'] = 'b'; var_dump($test['b']);
Output for 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 TypeError: Cannot access offset of type string on string in /in/4jafW:4 Stack trace: #0 {main} thrown in /in/4jafW on line 4
Process exited with code 255.
Output for 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Illegal string offset 'b' in /in/4jafW on line 4 Warning: Illegal string offset 'b' in /in/4jafW on line 5 string(1) "b"

preferences:
150.85 ms | 402 KiB | 186 Q