spl autoload忽略不存在的类

Question

我在php中有一个简单的MVC应用程序，该应用程序将第一个查询字符串映射到控制器名称，将第二个查询字符串映射到动作名称，再将其作为参数。 当自动加载类时，它会使用regex寻找命名约定，这很好，但是不会加载明显存在的类。

spl_autoload_register(function ($class) {
    if (preg_match('/[a-zA-Z]+Controller$/', $classname)) {
        if (class_exists(__DIR__ . '/controllers/' . $classname)) {
            //never gets to here, even though the file gets
            //included by the require statement below
        }
    require __DIR__ . '/controllers/' . $classname . '.php';
    return true;
}
});

//controller and action are "default" and "index" by default
//If a query string is passed, it gets the parts
$controller = $url[0];
$action = $url[1];

$controller_name = ucfirst($controller) . "Controller";
$action_name = $action . "Action";

if (class_exists($controller_name)) {
    $controller_object = new $controller_name($request, $config);
    $controller_object->$action_name();
} else {
    echo "Class doesn't exist : $controller_name";
}

示例输出：

url.com/ =类不存在“ DefaultController”

url.com/default =类不存在“ DefaultController”

url.com/test =类不存在“TestController”

DefaultController存在于controllers目录中。

Answer 1

尝试这个：

try {
  $controller_object = new $controller_name($request, $config);  
  $controller_object->$action_name();
} catch (Exception $e) {
    echo "Class doesn't exist : $controller_name";
}

Answer 2

您的条件调用class_exists()函数，您打算检查文件：

spl_autoload_register(function ($class) {
    if (preg_match('/[a-zA-Z]+Controller$/', $classname)) {
        if (file_exists(__DIR__ . '/controllers/' . $classname)) {
            require __DIR__ . '/controllers/' . $classname . '.php';
            return true;
        }
}
});