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run code in 200+ php & hhvm versions
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<?php namespace x { function a($x) { echo $x; } define('x\a', 'ftsoa'); } namespace { var_dump(defined('a'), \x\a); }
based on Oclha
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
bool(false) string(5) "ftsoa"