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run code in 300+ PHP versions simultaneously
<?php class Foo { const A = 'Foo::A'; const B = self::A . ' and ' . self::C; const C = 'Foo::C'; } class Bar extends Foo { const A = 'Bar::A'; const C = 'Bar::C'; } var_dump(Bar::B);

preferences:
63.64 ms | 402 KiB | 5 Q