PHP implements open source Apollo configuration center

With the continuous development of Internet business, the scale of application systems is getting larger and larger, and the management of system configurations has become more and more complex, thus increasing the workload and risks of operation and maintenance. In order to solve this problem, the configuration center came into being. The configuration center is a tool for centralized management of application system configuration, which can reduce the burden on operation and maintenance personnel and improve system reliability. This article will introduce how to use the open source Apollo Configuration Center to manage the configuration information of PHP application systems.

1. What is Apollo Configuration Center

Apollo is an open source configuration center, developed and open sourced by Ctrip R&D team, supporting Java, .NET, Node.js, Go, Python and other languages. Apollo provides a unified configuration management platform that can manage various types of configuration information, such as XML, Properties files, YAML, JSON, etc. Apollo also provides functions such as real-time configuration release, version management, and permission management, which can effectively manage the configuration information of the application system.

2. The combination of Apollo configuration center and PHP

Although Apollo is mainly designed for Java applications, through the open API and SDK provided by Apollo, PHP applications can also be easily Easily integrate with Apollo Configuration Center. The following describes the specific steps for using Apollo Configuration Center in PHP applications.

(1) Download Apollo PHP SDK

The GitHub address of Apollo PHP SDK is: https://github.com/php-deep/apollo-php-sdk.

(2) Create an application in the Apollo Configuration Center

Create an application in the Apollo Configuration Center. After the creation is completed, the following information can be obtained in the application management page:

• AppId: The unique identifier of the application.
• Namespace: The name of the namespace. An application can have multiple namespaces.

(3) Integrate Apollo in PHP application

Introduce Apollo PHP SDK into PHP application and initialize it through the following code:

require_once("ApolloClient.php");

$serverUrl = "http://apollo-config-server:8080"; //Apollo配置中心的地址

$appId = "myApp"; //应用的唯一标识符

$namespaceName = "application"; //命名空间的名称

//初始化Apollo客户端
$apolloClient = new ApolloClient($serverUrl, $appId, $namespaceName);

(4) Obtain configuration information

You can obtain configuration information through the following code:

//获取字符串类型的配置信息
$configValue = $apolloClient->getConfig("config-key", "default-value");

//获取数组类型的配置信息
$configArrayValue = $apolloClient->getArrayConfig("config-key", array());

where "config-key" is the name of the configuration item, and "default-value" is the default when the configuration item does not exist value.

(5) Monitoring configuration changes

Apollo supports real-time release of configuration information and notifies the application system to update. In order to achieve real-time configuration synchronization, PHP applications can monitor configuration change events through the following code:

$callback = function ($namespace) use ($apolloClient) {
    //配置发生变更时的处理代码
};

$apolloClient->setOnChangeCallback($callback);

3. Summary

By integrating the open source Apollo configuration center, PHP application systems can Implement centralized configuration management and support real-time publishing and updates. Configuration modifications made in the configuration center can be synchronized to the application system in a timely manner, which reduces the burden on operation and maintenance personnel and improves the reliability of the application system. At the same time, Apollo also provides version management, permission management and other functions, which can easily manage and maintain configuration information.

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