3v4l.org

run code in 300+ PHP versions simultaneously
<?php $r = new ReflectionClass('ArrayObject'); $constructorParameters = $r->getConstructor()->getParameters(); foreach ($constructorParameters as $parameter) { var_dump($parameter->getName()); }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(5) "array" string(5) "flags" string(13) "iteratorClass"
Output for 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
string(5) "input" string(5) "flags" string(14) "iterator_class"
Output for 7.0.2 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0
string(5) "array" string(8) "ar_flags" string(14) "iterator_class"
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.1
string(5) "array"

preferences:
131.52 ms | 402 KiB | 183 Q