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run code in 200+ php & hhvm versions
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<?php if (class_exists('SoapServer')) { var_dump((new ReflectionMethod('SoapServer', 'setClass'))->isVariadic()); }
based on kgvjo
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
Output for hhvm-3.18.5 - 3.22.0
bool(true)