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run code in 200+ php & hhvm versions
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<?php $ref = new ReflectionFunction('array_unique'); var_dump(count($ref->getParameters()));
based on aFIBk
Output for 5.6.17 - 5.6.28, 7.0.1 - 7.2.0
int(2)
Output for 5.3.20 - 5.6.16, 7.0.0
int(1)