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run code in 150+ php & hhvm versions
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<?php echo (isset($hello)) ? 'true' : 'false'; echo (!isset($hello)) ? 'false' : 'true';
based on muDcT
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
falsefalse