How to use a namespace alias (use) inside a class or function-CodePudding

In my script, I have two classes with the name "Exception". Normally, I would use

use PHPMailer\PHPMailer\Exception;

and then, use the class Exception that points to PHPMailer.

The problem is that I can't use the "use" command inside a function. So how can I declare what exception to use each time?

Example:

use PHPMailer\PHPMailer\PHPMailer;
use PHPMAiler\PHPMailer\Exceptions;
use PHPMailer\PHPMailer\SMTP;

class email {
  function send_with_smtp {
     $a = new PHPMailer();  // inside this class it needs the exceptions to be used as a PHPMailer\Exceptions
  }

  function send_with_critsend{
     $a = new MXM(); // inside this class it needs the exceptions to be used NOT as a PHPMailer\Exceptions
  }
}

What I would do -but can't because use is used only in the upper level- is the following (that is wrong of course). But this is what I would like to archieve:

class email {
  function send_with_smtp {
     use PHPMailer\PHPMailer\PHPMailer;
     use PHPMAiler\PHPMailer\Exceptions;
     use PHPMailer\PHPMailer\SMTP;

     $a = new PHPMailer();  // inside this class it needs the exceptions to be used as a PHPMailer\Exceptions
  }

  function send_with_critsend{
     use ANOTHER; // maybe the default Exceptions or something else.
     $a = new MXM(); // inside this class it needs the exceptions to be used NOT as a PHPMailer\Exceptions
  }
}

CodePudding user response：

Wouldn't you just reference the desired exception by its full name?

class alpha {
  function alphafunction {
     $a = new \PHPMailer\Exception\Exception();
  }
}

class beta {
  function betafunction {
     $a = new \AnotherClass\Exception\Exception();
  }
}

CodePudding user response：

To use a namespace alias (also called a "using directive") inside a class or function, you can place the using keyword followed by the namespace and the alias you want to use at the top of your class or function definition. For example:

namespace MyNamespace
{
    class MyClass
    {
        // Use the alias "alias" for the namespace "MyNamespace::MyOtherNamespace"
        using alias = MyNamespace::MyOtherNamespace;

        void MyFunction()
        {
            // Use the alias to access a class or function in the namespace
            alias::MyClass instance;
            instance.DoSomething();
        }
    }
}

In this example, the using directive creates an alias for the MyOtherNamespace namespace inside the MyNamespace namespace. This allows you to use the alias to access classes or functions in the MyOtherNamespace namespace without having to fully qualify their names.

CodePudding user response：

On one side you can use different files for different classes that use different Exceptions.

alpha .php

use PHPMailer\PHPMailer\Exception;
class alpha {
  function alphafunction {
     throw new Exception();
  }
}

beta.php

use AnotherClass\Exception\Exception;
class beta{
  function alphafunction {
     throw new Exception();
  }
}

But you can also do in one file:

use PHPMailer\PHPMailer\Exception as PHPMailerException ;
use AnotherClass\Exception\Exception as AnotherClassException;

class alpha {
  function alphafunction {
     throw new PHPMailerException();
  }
}

class beta {
  function betafunction {
     throw new AnotherClassException();
  }
}

Topic here: namespace aliases

If you want to know what exception you get from elsewhere do:

try {
  //do stuff here
} catch(\Exception $e){
  print get_class($e);
}