OOP Namespacing

Fatal error: Cannot declare class book, because the name is already in use

Cannot declare 2 classes with the same name in the same file

Fix: use different files

include ‘cbook.php’;

Fatal error: Cannot declare class book, because the name is already in use in C:\xampp\htdocs\OOPtutorial\cbook.php on line 3

Cannot use the same name for classes even if they are on different files if used with include

Fix: Use namespaces

namespace App\Library;
class book{

}

Fatal error: Uncaught Error: Class “book” not found

include ‘cbook.php’;

$library = new book();

Even if there are classes named book in cbook.php we still need to specify the namespace

include ‘cbook.php’;

$library = new book();

Fix: at class declaration: namespace\classname

$library = new App\Library\book();

Namespace: App\Library

Class: book()

Fatal error: Cannot use App\Library\book as book because the name is already in use

include ‘cbook.php’;
class book{
function __construct()
{
echo “From index <br>”;
}
}

use App\Library\book ;

$book = new book();

To fix, the imported class from the namespace:

use App\Library\book;

can have a different class name.

Fix:

use App\Library\book as bookFromLibrary;

$book = new book();
$book = new bookFromLibrary();