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To use composer to install a package and then assign a new namespace for it, follow these steps:

1. Open the terminal and navigate to your project directory.

2. Run the following command to create a new composer.json file:

composer init

1. Open the composer.json file and add the package you want to install. For example:

{
    "require": {
        "vendor/package": "^1.0"
    }
}

1. Run the following command to install the package:

composer install

1. After the package is installed, you can create a new namespace for it by adding the following code to your PHP file:

use NewNamespace\PackageClass;

require_once 'vendor/autoload.php';

class PackageClass extends \Vendor\Package\PackageClass {
    // New methods or overrides
}

1. Save the changes to the PHP file.

2. In the terminal, run the following command to update the autoload file:

composer dump-autoload

Now you can use the new namespace and the modified package class in your PHP application.