Description:
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According to the documentation, the Closure class implements __construct() and __invoke(). However, when ReflectionClass::hasMethod() and ReflectionClass::getMethods() are run against a closure, they do not report the existence of the __invoke() method. On user-defined classes, the existence of __invoke() is reported if __invoke() is defined.

Test script:
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$closure = function($a) { echo $a; };

$reflection = new ReflectionClass($closure);
var_dump($reflection->hasMethod('__invoke()');

Expected result:
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boolean true


Actual result:
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boolean false