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

preferences:
86.06 ms | 402 KiB | 5 Q