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<?php class Foo { const BAR = 'this is bar'; } var_dump(Foo::BAR); $str = 'BAR'; var_dump(constant(Foo::class. '::' . $str)); // var_dump(Foo::{$str}); -> これはできない
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
string(11) "this is bar" string(11) "this is bar"

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110.45 ms | 406 KiB | 5 Q