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<?php $func = new ReflectionFunction( 'define' ); var_dump($func->getParameters());
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { [0]=> object(ReflectionParameter)#2 (1) { ["name"]=> string(13) "constant_name" } [1]=> object(ReflectionParameter)#3 (1) { ["name"]=> string(5) "value" } [2]=> object(ReflectionParameter)#4 (1) { ["name"]=> string(16) "case_insensitive" } }

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