这是在函数内访问配置的最佳实践

<?php
define('ABSPATH', dirname(__FILE__)); //Absolute path to index
/*
* Method 1
* Dependency Injection
*/
class Config{
    private $_config = NULL;
    private $_filepath = NULL;
    public function __construct($filepath){
        $this->_filepath = $filepath;
        $this->load();
    }
    private function load(){
        if ($this->_config === NULL){
            if (!file_exists($this->_filepath)){
                throw new Exception('Configuration file not found');
            }else{
                $this->_config = parse_ini_file($this->_filepath);
            }
        }
    }
    public function get($key){
        if ($this->_config === NULL){
            throw new Exception('Configuration file is not loaded');
        }
        if (isset($this->_config[$key])){
            return $this->_config[$key];
        }else{
            throw new Exception('Variable ' . $key . ' does not exist in configuration file');
        }
    }
}
function getLost($where, $why, $who){
    //do smth
}
try{
    $config = new Config(ABSPATH . '/app/config.ini');
    getLost('here', 'because', $config->get('who'));    
}catch(Exception $e){
    echo $e->getMessage();
}
?>

<?php
/*
* Method 2
* Config is accessed via static class
*/
class Config{
    private static $_config = NULL;
    private static $_filepath = NULL;
    public static function load($filepath){
        if (self::$_config === NULL){
            self::$_filepath = $filepath;
            if (!file_exists(self::$_filepath)){
                throw new Exception('Configuration file not found');
            }else{
                self::$_config = parse_ini_file(self::$_filepath);
            }
        }
    }
    public static function get($key){
        if (self::$_config !== NULL){
            throw new Exception('Configuration file is not loaded');
        }
        if (isset(self::$_config[$key])){
            return self::$_config[$key];
        }else{
            throw new Exception('Variable ' . $key . ' does not exist in configuration file');
        }
    }
}
function getLost($where, $why){
    $who = Config::get('who');
}
try{
    Config::load(ABSPATH . '/app/config.ini');
    getLost('here', 'because');    
}catch(Exception $e){
    echo $e->getMessage();
}
?>

<?php
/**
* Method 3
* Config variable needed is passed as function parameter
*/
$config = parse_ini_file(ABSPATH . '/app/config.ini');
function getLost($where, $why, $who){
    //do smth
}
getLost('here', 'because', $config['who']);
?>

<?php
/*
* Mathod 4
* Config is accessed inside a function via global
*/
$config = parse_ini_file(ABSPATH . '/app/config.ini');
function getLost($where, $why){
    global $config;
    $who = $config['who'];
}
getLost('here', 'because');
?>

以下哪种变体是最佳实践解决方案？如果没有，请提供您的变体。