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<?php var_dump(substr('Ä', 1));
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.30, 7.4.0 - 7.4.23, 8.0.0 - 8.0.10, 8.1rc1 - rc2
string(1) "�"

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64.75 ms | 459 KiB | 5 Q