T_PAAMAYIM_NEKUDOTAYIM听起来真的很异国情调，但对我来说绝对是胡说八道。我将其全部追溯到以下代码行：

<?php
Class Context {
    protected $config;

    public function getConfig($key) { // Here's the problem somewhere...
    $cnf = $this->config;
    return $cnf::getConfig($key);
    }

    function __construct() {
    $this->config = new Config();
    }
}
?>

在构造函数中，我创建一个Config对象。这是课程：

final class Config {
    private static $instance = NULL;
    private static $config;

    public static function getConfig($key) {
    return self::$config[$key];
    }

    public static function getInstance() {
    if (!self::$instance) {
        self::$instance = new Config();
    }
    return self::$instance;
    }

    private function __construct() {
    // include configuration file
    include __ROOT_INCLUDE_PATH . '/sys/config/config.php'; // defines a $config array
    $this->config = $config;
    }
}

不知道为什么这不起作用/错误是什么意思…