What is a namespace in PHP?

A namespace is a way to group classes, functions and constants under a name. It avoids name conflicts, when two libraries have a class with the same name, for example User or Logger.

Think of it like folders on your computer. Two files can have same name if they are in different folders.

<?php
namespace App\Models;

class User {
}

// ::class gives the full name including namespace
echo User::class;
?>

Output:

To use a class from another namespace, write its full name, or import it with the use keyword at the top of the file.

<?php
use App\Models\User;

$user = new User();
?>

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