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<?php ${0} = 'value'; $o = (object) compact('0'); var_dump($o->{0});
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.26, 8.0.0 - 8.0.13, 8.1rc1 - rc3
string(5) "value"

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41.91 ms | 459 KiB | 5 Q