读取配置（Reading Configurations）

Phalcon\Config 是一个用于将各种格式的配置文件读取到PHP对象的组件（使用适配器）。

文件适配器（File Adapters）

可用的适配器有:

原生数组（Native Arrays）

下面的例子展示如何将本地数组导入 Phalcon\Config 对象。此选项提供了最好的性能，因为在这个请求中没有读取文件。

<?php
 
use Phalcon\Config;
 
$settings = array(
    "database" => array(
        "adapter"  => "Mysql",
        "host"     => "localhost",
        "username" => "scott",
        "password" => "cheetah",
        "dbname"   => "test_db"
    ),
     "app" => array(
        "controllersDir" => "../app/controllers/",
        "modelsDir"      => "../app/models/",
        "viewsDir"       => "../app/views/"
    ),
    "mysetting" => "the-value"
);
 
$config = new Config($settings);
 
echo $config->app->controllersDir, "\n";
echo $config->database->username, "\n";
echo $config->mysetting, "\n";

如果你想更好的组织你的项目，你可以在另一个文件保存数组，然后读入它。

<?php
 
use Phalcon\Config;
 
require "config/config.php";
$config = new Config($settings);

读取 PHP 文件（Reading PHP Files）

通过加载 PHP 文件获取配置信息，配置文件内容如下：

<?php
return array(
    "database" => array(
        "adapter" => "Mysql",
        "host     => localhost",
        "username => scott",
        "password => cheetah",
        "dbname   => test_db",
    ),
    "phalcon" => array(
        "controllersDir => "../app/controllers/",
        "modelsDir      => "../app/models/",
        "viewsDir       => "../app/views/",
    ),
);

访问方式如下所示：

<?php
 
$config = new Phalcon\Config\Adapter\Php("path/config.php");
 
echo $config->phalcon->controllersDir, "\n";
echo $config->database->username, "\n";

读取 INI 文件（Reading INI Files）

INI文件是存储设置的常用方法。 Phalcon\Config\Adapter\Ini 采用优化的PHP函数parse_ini_file读取这些文件。为方便访问，文件部分解析成子设置。

[database]
adapter  = Mysql
host     = localhost
username = scott
password = cheetah
dbname   = test_db
 
[phalcon]
controllersDir = "../app/controllers/"
modelsDir      = "../app/models/"
viewsDir       = "../app/views/"
 
[models]
metadata.adapter  = "Memory"

访问方式如下所示：

<?php
 
use Phalcon\Config\Adapter\Ini as ConfigIni;
 
$config = new ConfigIni("path/config.ini");
 
echo $config->phalcon->controllersDir, "\n";
echo $config->database->username, "\n";
echo $config->models->metadata->adapter, "\n";

读取 YAML 文件（Reading Yaml Files）

通过解析 YAML 文件获取配置信息，配置文件内容如下：

phalcon:
  baseuri: /phalcon/
models:
  metadata: memory
database:
  adapter: mysql
  host: localhost
  username: user
  password: passwd
  name: demo

访问方式如下所示：

<?php
 
$config = new Phalcon\Config\Adapter\Php("path/config.php");
 
echo $config->phalcon->baseuri, "\n";
echo $config->database->username, "\n";

合并配置（Merging Configurations）

Phalcon\Config 允许合并配置对象到另一个:

<?php
 
use Phalcon\Config;
 
$config = new Config(
    array(
        'database' => array(
            'host'   => 'localhost',
            'dbname' => 'test_db'
        ),
        'debug' => 1
    )
);
 
$config2 = new Config(
    array(
        'database' => array(
            'dbname'   => 'production_db',
            'username' => 'scott',
            'password' => 'secret'
        ),
        'logging' => 1
    )
);
 
$config->merge($config2);
 
print_r($config);

上面的代码会产生以下内容:

Phalcon\Config Object
(
    [database] => Phalcon\Config Object
        (
            [host] => localhost
            [dbname]   => production_db
            [username] => scott
            [password] => secret
        )
    [debug] => 1
    [logging] => 1
)

原文: http://www.myleftstudio.com/reference/config.html