3v4l.org

run code in 300+ PHP versions simultaneously
<?php class T { const FlagExec = (1 << 0), FlagWrite = (1 << 1), FlagRead = (1 << 2), FlagAll = (0 | self::FlagExec | self::FlagWrite | self::FlagRead ); } var_dump( T::FlagExec, T::FlagWrite, T::FlagRead, T::FlagAll );
based on LL1LK
Output for 7.3.0 - 7.3.27, 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
int(1) int(2) int(4) int(7)