test = function ($params) { return (method_exists($params, 'cb1')) ? $params->cb1("hello") : false; }; $ret = $a->executeString('PHP.test(function (foo) { return foo + " world"; });'); var_dump(__LINE__, $ret); // Test is_a() $a->test = function ($params) { return (is_a($params, 'V8Object')) ? $params->cb1("hello") : false; }; $ret = $a->executeString('PHP.test({ "cb1" : function (foo) { return foo + " world"; } });'); var_dump(__LINE__, $ret); // Test is_a() $a->test = function ($params) { return (is_a($params, 'V8Function')) ? $params("hello") : false; }; $ret = $a->executeString('PHP.test(function (foo) { return foo + " world"; });'); var_dump(__LINE__, $ret); // Should not work with object $a->test = function ($params) { return (is_a($params, 'Closure')) ? $params("hello") : false; }; $ret = $a->executeString('PHP.test({ "cb1" : function (foo) { return foo + " world"; } });'); var_dump(__LINE__, $ret); $a->test = function ($params) { var_dump($params); return $params->cb1("hello"); }; $ret = $a->executeString('PHP.test({ "cb1" : function (foo) { return foo + " world"; } });'); var_dump(__LINE__, $ret); // FIX! method_exists() Leaks! $a->test = function ($params) { var_dump($params, method_exists($params, 'cb1'), $params->cb1); }; $ret = $a->executeString('PHP.test({ "cb1" : function (foo) { return foo + " world"; } });');