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<?php $closure1 = function($val){ return $val; }; $closure2 = function($val){ return $val; }; $reflection_class = new ReflectionClass($closure1); $reflection_method = $reflection_class->getMethod('__invoke'); $arguments1 = array('hello'); $arguments2 = array('world'); // Invoking once is OK... print $reflection_method->invokeArgs($closure1, $arguments1); if(true){ // But don't do it again! #print $reflection_method->invokeArgs($closure1, $arguments1); // Using different arguments per invokation makes no difference :( #print $reflection_method->invokeArgs($closure1, $arguments2); // Doesn't matter if you attempt to invoke a different closure with the same reflection. print $reflection_method->invokeArgs($closure2, $arguments1);