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run code in 150+ php & hhvm versions
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<?php (@WTF == 'WTF') && define('WTF', 'foo'); echo "result of var_dump(WTF):\r\n"; var_dump(WTF);
Output for 4.3.0 - 7.1.0
result of var_dump(WTF): string(3) "foo"