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run code in 300+ PHP versions simultaneously
<?php class Foo { const A = 1 << 0; const B = self::A | self::C; const C = 1 << 1; } class Bar extends Foo { const A = 1 << 2; const C = 1 << 3; } var_dump(decbin(Bar::B));

preferences:
25.07 ms | 405 KiB | 5 Q