How does Dependency Injection play a role in PHP frameworks like Phalcon when it comes to database connections and model instantiation?

In PHP frameworks like Phalcon, Dependency Injection is crucial for managing database connections and instantiating models. By injecting database connection objects into model classes, we can easily switch between different database providers or configurations without changing the model code. This promotes code reusability, testability, and flexibility in our applications. 

use Phalcon\Db\Adapter\Pdo\Mysql as DbAdapter;

class User extends \Phalcon\Mvc\Model
{
    protected $db;

    public function initialize()
    {
        $this->db = new DbAdapter([
            'host'     => 'localhost',
            'username' => 'root',
            'password' => 'password',
            'dbname'   => 'my_database'
        ]);
    }
}

Keywords

Dependency Injection PHP frameworks Phalcon database connections model instantiation

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