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<?php function add(int $a, int $b): int { return $a + $b; } $c = Closure::fromCallable('add'); $r = new ReflectionFunction($c); echo $r; $c = fn(...$args) => add(...$args); $r = new ReflectionFunction($c); echo $r;
Output for git.master, git.master_jit, rfc.property-hooks
Closure [ <user> function add ] { @@ /in/XBOmJ 3 - 3 - Parameters [2] { Parameter #0 [ <required> int $a ] Parameter #1 [ <required> int $b ] } - Return [ int ] } Closure [ <user> function {closure} ] { @@ /in/XBOmJ 9 - 9 - Parameters [1] { Parameter #0 [ <optional> ...$args ] } }

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