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<?php define('MY_CONST', 'hello'); var_dump(MY_CONST[1]);
Output for 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.30, 7.4.0 - 7.4.23, 8.0.0 - 8.0.10, 8.1rc1 - rc2
string(1) "e"
Output for 5.5.0 - 5.5.36
Parse error: syntax error, unexpected '[' in /in/lWqe0 on line 3
Process exited with code 255.

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