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run code in 150+ php & hhvm versions
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<?php $a = false; $b = false; var_dump($a ? $b ? 'b' : 'c' : 'a'); var_dump($a ? ($b ? 'b' : 'c') : 'a');
based on hSOVi
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(1) "a" string(1) "a"
Output for hhvm-3.10.0

Process exited with code 153.