JS数据类型澄清(JS data type clarification)

 您的类源文件中根本不应包含任何require_once语句。 按照PSR-4规范进行命名。 将您的类放在命名空间中以避免与您可能通过composer包含的其他类冲突。 然后将一个类放在一个文件中，命名与该类相同。 例如，LoginSystem类应该位于名为LoginSystem.php的文件中。 
 
namespace MyNamespace;

class LoginSystem
{
    ...
}
 
 然后设置您的composer.json将您的命名空间指向您的源目录： 
 
"autoload": {
    "psr-4": {
        "MyNamespace\\": "src/"
    }
},
 
 现在，您的主应用程序调用程序或前端控制器应该是包含自动加载器的唯一位置： 
 
require_once 'vendor/autoload.php';
$login = new \MyNamespace\LoginSystem();
...

Your class source files shouldn't have any require_once statements at all in them. Follow the PSR-4 spec for naming. Put your classes in a namespace to avoid collision with other classes you might include via composer. Then put one class in one file, named the same as the class. For example, the LoginSystem class should be in a file named LoginSystem.php.
 
namespace MyNamespace;

class LoginSystem
{
    ...
}
 
Then set your composer.json to point your namespace to your source directory:
 
"autoload": {
    "psr-4": {
        "MyNamespace\\": "src/"
    }
},
 
Now, your main app invoker or front controller should be the only place that includes the autoloader:
 
require_once 'vendor/autoload.php';
$login = new \MyNamespace\LoginSystem();
...