无论如何在PHP中定义公共或私有或受保护的类

Question

Is there anyway to create public or private or protected classes in a namespace just like java?

like...

namespace foo;

public class Account {
  .......
}


private class PrivateAccount {
 .......
}

please let me know if there is any workaround to do this in PHP.

Answer 1

No, classes in PHP may not be anything but public and that is declared implicitly. From the PHP docs on classes in PHP5 :

Basic class definitions begin with the keyword class, followed by a class name, followed by a pair of curly braces which enclose the definitions of the properties and methods belonging to the class.

Putting a visibility keyword in front of the class will likely result in a fatal error.

Answer 2

Typically what you do is declare the constructor of the class private. Then you can create a separate static function in the class that will do some checks (ie check the namespace) and conditionally return an instance of the class by calling the private constructor. This is also typically how you implement singletons.