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run code in 150+ php & hhvm versions
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<?php var_dump(function_exists('define')); define('A', 100); $f = 'define'; $f('B', $f); class A { }
based on NKKEK
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true)
Output for hhvm-3.10.0

Process exited with code 153.