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<?php $refFunc = new ReflectionFunction('call_user_func'); foreach( $refFunc->getParameters() as $param ){ print $param; } ?>
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
Parameter #0 [ <required> callable $callback ]Parameter #1 [ <optional> mixed ...$args ]
Output for 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Parameter #0 [ <required> $function_name ]Parameter #1 [ <optional> ...$parameters ]
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35
Parameter #0 [ <required> $function_name ]Parameter #1 [ <optional> $parmeter ]Parameter #2 [ <optional> $... ]
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: reflectionfunction in /in/Bgeo5 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: reflectionfunction in /in/Bgeo5 on line 2

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