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<?php namespace blah; function test($callback){ var_dump($callback); if($callback instanceof \Closure){ echo "yeah, it's a closure\n"; } } namespace blah2; \blah\test(function ($param){ echo $param; });
Output for git.master, git.master_jit, rfc.property-hooks
object(Closure)#1 (1) { ["parameter"]=> array(1) { ["$param"]=> string(10) "<required>" } } yeah, it's a closure

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