ThinkPHP5.1
thinkphp\library\think\route\dispatch\Module.php P108 用到 is_callable()方法
???????if (is_callable([$instance, $action])) { ???????????// 执行操作方法 ???????????$call = [$instance, $action]; ???????????// 自动获取请求变量 ???????????$vars = $this->app->config(‘app.url_param_type‘) ???????????? $this->app[‘request‘]->route() ???????????: $this->app[‘request‘]->param(); ???????} elseif (is_callable([$instance, ‘_empty‘])) { ???????????// 空操作 ???????????$call = [$instance, ‘_empty‘]; ???????????$vars = [$actionName]; ???????} else { ???????????// 操作不存在 ???????????throw new HttpException(404, ‘method not exists:‘ . get_class($instance) . ‘->‘ . $action . ‘()‘); ???????} ???????$this->app[‘hook‘]->listen(‘action_begin‘, $call); ???????return Container::getInstance()->invokeMethod($call, $vars); ???}但是当 $instance中有 __call 方法时，is_callable([$instance, $action]) 返回的总为true，需要注意，貌似Thinkphp5中反射导致的__call方法无效（个人临时理解)
colin 03-Oct-2010 08:30 ?//代码块来自PHP手册 I haven‘t seen anyone note this before, but is_callable will correctly determine the existence of methods made with __call. The method_exists function will not. Example:<?phpclass Test { ????public function testing($not = false) { ????????$not = $not ? ‘true‘ : ‘false‘; ????????echo "testing - not: $not<br/>"; ????} ?????????public function __call($name, $args) { ????????if(preg_match(‘/^not([A-Z]\w+)$/‘, $name, $matches)) { ????????????$fn_name = strtolower($matches[1]); ????????????if(method_exists($this, $fn_name)) { ????????????????$args[] = true; // add NOT boolean to args ????????????????return call_user_func_array(array($this, $matches[1]), $args); ????????????} ????????} ????????die("No method with name: $name<br/>"); ????} }$t = new Test();$t->testing();$t->notTesting(); echo "exists: ".method_exists($t, ‘notTesting‘).‘<br/>‘; echo "callable: ".is_callable(array($t, ‘notTesting‘));?> Output: testing - not: false testing - not: true exists: callable: 1 PHP|ThinPHP5杂技
原文地址：http://www.cnblogs.com/8000cabbage/p/7513836.html