What are the benefits of storing constant values in a configuration file and using dependency injection to pass them to classes in PHP applications?

Storing constant values in a configuration file and using dependency injection to pass them to classes in PHP applications allows for easier management and modification of these values without directly changing the code. This approach also promotes better separation of concerns and improves the testability of the code. 

// config.php
return [
    'database_host' => 'localhost',
    'database_name' => 'my_database',
    'database_user' => 'root',
    'database_pass' => 'password'
];

// DatabaseConnection.php
class DatabaseConnection {
    private $host;
    private $name;
    private $user;
    private $pass;

    public function __construct($config) {
        $this->host = $config['database_host'];
        $this->name = $config['database_name'];
        $this->user = $config['database_user'];
        $this->pass = $config['database_pass'];
    }

    // Database connection methods using $this->host, $this->name, $this->user, $this->pass
}

// index.php
$config = require 'config.php';
$databaseConnection = new DatabaseConnection($config);

Keywords

constant values configuration file dependency injection classes PHP applications

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