How can Dependency Injection be used to provide configuration settings to a class in PHP?

When using Dependency Injection in PHP, configuration settings can be passed to a class by injecting a configuration object or array into the class constructor. This allows the class to access the configuration settings without directly depending on a global configuration object or file, making the class more flexible and testable. 

class MyClass {
    private $config;

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

    public function getConfigValue($key) {
        return $this->config[$key] ?? null;
    }
}

// Usage
$config = [
    'database_host' => 'localhost',
    'database_name' => 'mydatabase',
    'database_user' => 'root',
    'database_pass' => 'password'
];

$myClass = new MyClass($config);
echo $myClass->getConfigValue('database_host'); // Output: localhost

Keywords

Dependency Injection configuration settings class PHP libraries

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