How can dependency injection be utilized to access configuration settings in PHP classes?

When using dependency injection in PHP classes, configuration settings can be accessed by passing a configuration object or array as a dependency to the class constructor. This allows the class to retrieve the necessary configuration settings without directly accessing them from a global scope or configuration file, making the code more modular and testable. 

<?php

class DatabaseConnection {
    private $config;

    public function __construct(array $config) {
        $this->config = $config;
    }

    public function connect() {
        $dsn = "mysql:host={$this->config['host']};dbname={$this->config['database']}";
        $username = $this->config['username'];
        $password = $this->config['password'];

        // Connect to the database using $dsn, $username, and $password
    }
}

// Configuration settings
$config = [
    'host' => 'localhost',
    'database' => 'my_database',
    'username' => 'root',
    'password' => 'password'
];

// Instantiate DatabaseConnection class with configuration settings
$databaseConnection = new DatabaseConnection($config);

// Use the database connection
$databaseConnection->connect();

Keywords

dependency injection configuration settings PHP classes access utilization

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