How can one properly integrate Doctrine into Zend in a PHP application?

To properly integrate Doctrine into Zend in a PHP application, you can use the DoctrineORMModule for Zend Framework 2 or 3. This module provides integration between Doctrine ORM and Zend Framework. You will need to install the module using Composer and configure it in your application configuration.

// In your composer.json file, add the following dependency:
"doctrine/doctrine-orm-module": "^2.0"

// Run composer update to install the module

// In your Zend application configuration file (e.g., module.config.php), add the following configuration:
return [
    'doctrine' => [
        'driver' => [
            'application_entities' => [
                'class' => 'Doctrine\ORM\Mapping\Driver\AnnotationDriver',
                'cache' => 'array',
                'paths' => [__DIR__ . '/../src/Application/Entity']
            ],

            'orm_default' => [
                'drivers' => [
                    'Application\Entity' => 'application_entities'
                ]
            ]
        ]
    ]
];