Using namespaces in PHP

Question

I am working on the AWS documentation which uses Guzzle framework. I have to deal with namespaces here and I am not able to get it working. I went through the docs and examples and understood that we can have packages for projects using namespaces.

I went ahead and tried a simple example, but unsuccessful. Here's the example: this is the index.php :

     use My\Full\Classname as Another;  //Also tried use My\Full\Classname
     $obj = new Another;                //with  $obj = new Classname;    
     echo $obj->add();

I have Classname.php in the directory structure like this My->Full->Classname.php :

     <?php
        class Classname{
        public static function add(){
                return 2+2;
            }
         }
     ?>

I am trying to call the function in index.php but getting error:

Fatal error: Class 'Another' not found in C:\wamp\www\guzzleEx\index.php on line 19

which is the line where I instantiate the Classname object $obj = new Another;

What is the mistake i am making? Is there any INI that needs to be updated or any other config issue? How can I make the code working? If you use the normal include for Classname.php it works fine.

Answer 1

Namespaces need to be explicitly declared, they do not come from a certain directory structure.

So if you do not have a line that reads namespace My\\Full; in front of your class Classname , then your class is not in any namespace, but in the root namespace.

Thus you cannot use it as \\My\\Full\\Classname , but \\Classname or even Classname directly.