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run code in 150+ php & hhvm versions
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<?php define('Ha', false); define('Ha', true); var_dump(Ha);
Output for 5.5.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Constant Ha already defined in /in/6clNi on line 3 bool(false)
Output for 4.3.0 - 5.4.45
bool(false)