<?php
require 'vendor/autoload.php';

use Eyeofcloud\EyeofcloudFactory;
$eyeofcloudToken = '<YOUR_SDK_KEY>';

$eyeofcloudClient = EyeofcloudFactory::createDefaultInstance($eyeofcloudToken);

if ($eyeofcloudClient->isValid())
{
    /* --------------------------------
     * to get rapid demo results, generate random users. Each user always sees the same variation unless you reconfigure the flag rule.
     * --------------------------------
    */

    mt_srand();
    $hasOnFlags = false;
    for ($i = 0;$i < 10;$i++)
    {
        $userId = strval(mt_rand(1000, 9999));
        /* --------------------------------
           Create hardcoded user & bucket user into a flag variation
           --------------------------------
        */
        $user = $eyeofcloudClient->createUserContext($userId);
        // "product_sort" corresponds to a flag key in your Eyeofcloud project
        $decision = $user->decide('product_sort');
        // did decision fail with a critical error?
        if (empty($decision->getVariationKey()))
        {
            printf("decision error:  %s", implode(', ', $decision->getReasons()));
        }

        // get a dynamic configuration variable
        // "sort_method" corresponds to a variable key in your Eyeofcloud project
        $sortMethod = $decision->getVariables() ['sort_method'];

        /* --------------------------------
        Mock what the users sees with print statements (in production, use flag variables to implement feature configuration)
        --------------------------------
        */

        // always returns false until you enable a flag rule in your Eyeofcloud project
        $enabled = $decision->getEnabled();

        if ($enabled)
        {
            $hasOnFlags = true;
        }
        printf("\n\nFlag %s. User number %s saw flag variation %s and got products sorted by %s config variable as part of flag rule: %s", $enabled ? "on" : "off", $user->getUserId() , $decision->getVariationKey() , $sortMethod, $decision->getRuleKey());
    }

    if (!$hasOnFlags)
    {
        printf("\n\n Flag was off for everyone. Some reasons could include: 
            \n Your sample size of visitors was too small. Rerun, or increase the iterations in the FOR loop 
            \n Check your SDK key. Verify in Settings>Environments that you used the right key for the environment where your flag is toggled to ON. 
            \ncheck your key at  https://app.eyeofcloud.com/v2/projects/%s settings/implementation", $eyeofcloudClient
            ->configManager
            ->getConfig()
            ->getProjectId());
    }
}

else
{
    printf("Eyeofcloud client invalid. Verify in Settings>Environments that you used the primary environment's SDK key");
}

?>

🚧 重要
暂时不要运行应用程序，因为仍然需要在云眼应用程序中设置标帜。

第二部分：运行应用程序

完成第一部分后，应用将不执行任何操作。需要在云眼应用程序中创建标帜和标帜规则才能启用该应用程序。

1. 创建特性标帜(Feature Flag)

通过特性标帜(Feature Flag)，可以控制在应用中看到新功能代码的用户。对于本快速入门，假设你正在推出一个重新设计的排序功能来显示产品。

在云眼中创建一个名为 product_sort 的标帜，并为其提供一个名为 sort_method 的变量：

转到标帜>创建标帜。
将标帜键命名为_product_sort_，然后单击**“创建标帜**”，该标帜对应于示例应用中的标帜键。
转到默认变量，然后单击新建 （+）。
将变量类型设置为_字符串_。
将变量命名_为 sort_method_，该名称对应于示例应用中的变量键。
将变量默认值设置为_字母顺序_，表示旧的排序方法。

单击右下角的保存以保存变量。
转到变体**，**然后点击默认的“开启”变体。变体是变量值集合的包装器。
将sort_method变量值设置为 popular_first，表示新的排序方法。

单击保存。

2. 创建标帜传递规则

示例应用_仍_不执行任何操作，因为需要在应用中创建并启用标帜规则。

为_product_sort_标帜的“开启”变体制定有针对性的投放规则。有针对性的交付允许逐步向用户发布特性标帜(Feature Flag)，但可以灵活地在遇到错误时将其回滚。

验证您是否在主环境中（因为您使用的是主环境 SDK 密钥）：

点击添加规则，然后选择定向投放。
将流量滑块设置为 50%。这会将标帜传递给在此环境中触发标帜的每个人的 50%。可以随时将product_sort标帜推出或回滚到流量的百分比。
从“传递”下拉列表中，选择“打开”。
单击保存。

为标帜规则启用标帜：

3. 运行示例应用

在终端中，对之前创建的示例应用运行以下命令：

PowerShell

php eyeofcloud-php-quickstart.php

运行之前创建的示例代码。输出类似于以下内容：

PHP

Flag on. User number 6998 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

Flag on. User number 1177 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

Flag on. User number 9714 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

Flag on. User number 4140 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

Flag on. User number 4994 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

Flag off. User number 8700 saw flag variation: off and got products sorted by: alphabetical config variable as part of flag rule: default-rollout-208-19963693913

Flag off. User number 9912 saw flag variation: off and got products sorted by: alphabetical config variable as part of flag rule: default-rollout-208-19963693913

Flag on. User number 6560 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

Flag on. User number 9252 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

Flag on. User number 6582 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: targeted_delivery

📘 注意
在“开启”变体中，您不会获得恰好 50% 的用户流量，因为您正在与如此少量的访问者合作。此外，获得“关闭”标帜的用户没有进入您设置的 50% 流量，因此他们跌落到默认的“关闭”规则（前面的打印语句中的_默认推出_）：

4. 工作原理

到目前为止，您：

在云眼应用程序中创建了标帜、标帜变量和标帜变体（变量的包装器）
使用 Decide 方法在应用中实现了标帜

示例应用中发生了什么？

工作原理：决定向用户显示标帜

PHP SDK 的 Decide 方法确定是显示还是隐藏特定用户的特性标帜(Feature Flag)。

📘 注意
可以将此方法重用于不同的标帜规则，无论是向更多流量投放，还是运行实验以仅向部分用户展示不同的排序方法。

了解哪种排序方法最能提高销售额后，请将产品排序标帜推广到所有流量，并将该方法设置为最佳值。

在示例应用中：

PHP

$user = $eyeofcloudClient->createUserContext('user_232');
// "product_sort" corresponds to the flag key you create in the Eyeofcloud app
$decision = $user->decide('product_sort');

📘
Note
（可选）在创建用户时包括属性（未显示在示例应用中），以便可以定位特定受众。例如：
PHP
$user = $eyeofcloud->createUserContext('user123');
$user->setAttribute('is_logged_in', true);

工作原理：配置标帜变体

可以使用标帜变量动态配置标帜变体。在示例应用中：

PHP

// always returns false until you enable a flag rule in the Eyeofcloud app
$enabled = $decision->getEnabled();
if ($enabled) 
{ 
  // "sort_method" corresponds to variable key you define in Eyeofcloud app
 $sort_method = $decision->getVariables()['sort_method'];
 printf("sort_method %s", $sort_method);
}

对于product_sort标帜，可以配置具有不同sort_method值的变体，按热门产品、相关产品、推广产品等进行排序。可以随时在云眼应用程序中为排序方法设置不同的值。

第三部分：运行 A/B 测试

本教程只是指导您完成有针对性的交付，因为它是最简单的标帜规则。但是，在推出特性标帜(Feature Flag)传递之前，你通常需要对用户_对_特性标帜(Feature Flag)变体的反应进行 A/B 测试。

下表显示了标帜传递和 A/B 测试之间的差异：

目标投放规则

A/B 测试规则

可以将标帜推广到一定比例的一般用户群（或特定受众），或者在遇到错误时回滚。

在投资交付之前，通过 A/B 测试标帜进行实验，这样您就知道要构建什么。跟踪用户在标帜变体中的行为，然后使用云眼统计引擎解释实验结果。

现在，A / B测试product_sort标帜的“on”变体。

1. 添加事件跟踪

需要将跟踪事件方法添加到示例应用，以便可以模拟用户事件，然后查看指标。

删除旧的示例代码，并粘贴以下代码。
请记得再次更换开发工具包密钥。
不要运行应用程序，因为仍然需要在云眼应用程序中设置 A/B 测试。

PHP

<?php
require 'vendor/autoload.php';

use Eyeofcloud\EyeofcloudFactory;

$eyeofcloudToken = '<YOUR_SDK_KEY>';
// For more instantiation configuration, see the PHP SDK reference
$eyeofcloudClient = EyeofcloudFactory::createDefaultInstance($eyeofcloudToken);
      /* --------------------------------
         OPTIONAL: Add a notification listener so you can integrate with third-party analytics platforms
         --------------------------------
      */
      /*
        function onDecision($type, $userId, $attributes, $decisionInfo) {
        if ($type == "flag"){
        $serializedJsonInfo = json_encode($decisionInfo);
        printf("Feature flag access related information: %s", $serializedJsonInfo);
        // Send data to analytics provider here
            }
        }

        $eyeofcloudClient->notificationCenter->addNotificationListener(
            NotificationType::DECISION,
            'onDecision'
        );
      */
      /* --------------------------------
       * to get rapid demo experiment results, generate random users. Each user is deterministically hashed into a variation.
       * --------------------------------
*/

mt_srand();
$hasOnFlags = false;
for ($i = 0; $i < 5; $i++) {
    $userId = strval(mt_rand(1000, 9999));
     /* --------------------------------
           Bucket user into a flag variation and mock experiment results
        --------------------------------
    */
    $user = $eyeofcloudClient->createUserContext($userId);
    $decision = $user->decide('product_sort');
    // did decision fail with a critical error?
    if (empty($decision->getVariationKey()))
    {
        printf("decision error:  %s", implode(', ', $decision->getReasons()));
    }

    $sortMethod = $decision->getVariables() ['sort_method'];
    $enabled = $decision->getEnabled();
    if ($enabled)
    {
      $hasOnFlags = true;
    }
    // Mock what the users sees with print statements (in production, use flag variables to implement feature configuration)
    // always returns false until you enable a flag rule in your Eyeofcloud project
  
    printf("\n\nFlag %s. User number %s saw flag variation %s and got products sorted by %s config variable as part of flag rule: %s\n", $enabled ? "on" : "off", $user->getUserId() , $decision->getVariationKey() , $sortMethod, $decision->getRuleKey());
    MockPurchase($user);
}

if (!$hasOnFlags)
{
  printf("\n\nFlag was off for everyone. Some reasons could include:" +
  "\n1. Your sample size of visitors was too small. Rerun, or increase the iterations in the FOR loop" +
  "\n2. By default you have 2 keys for 2 project environments (dev/prod). Verify in Settings>Environments that you used the right key for the environment where your flag is toggled to ON." +
  "\nCheck your key at https://app.eyeofcloud.com/v2/projects/%s/settings/implementation", $eyeofcloudClient->configManager->getConfig()->getProjectId());
}
else 
{
  printf("\n\nDone with your mocked A/B test.");
  printf("\nCheck out your report at  https://app.eyeofcloud.com/v2/projects/%s/reports", $eyeofcloudClient->configManager->getConfig()->getProjectId());
  printf("\nBe sure to select the environment that corresponds to your SDK key");

}

function MockPurchase($user)
    {
      printf(" Pretend that user %s made a purchase? y/n ", $user->getUserId());
      $answer = readline();

      if (strcmp(strtolower($answer), "y") == 0){
        // track a user event you defined in the Eyeofcloud app
        $user->trackEvent("purchase");
        printf("Eyeofcloud recorded a purchase in experiment results for user %s ", $user->getUserId());
      }
      else
      {
         printf("Eyeofcloud didn't record a purchase in experiment results  for user %s", $user->getUserId());
      }
    }

?>

2. 暂停免费帐户中的其他规则

如果你有免费帐户，则需要在保存 A/B 测试之前暂停之前在本快速入门中创建的目标交付：

选择包含您计划暂停的目标投放的特定标帜。

选择要暂停的环境和目标投放。
单击右上角的禁用规则按钮。

3. 创建 A/B 测试

要在云眼项目中创建和启动实验，请执行以下操作：

转到旗帜的规则。
单击“> A/B 测试添加规则”。

4. 添加事件

在实验中，将跟踪用户的相关操作，以衡量用户对特性标帜(Feature Flag)变体的反应。需要定义要跟踪的操作：

单击**“指标**”字段。
点击创建新活动。

对于事件密钥，输入_购买_并单击创建事件。（您想知道新的排序标帜是否帮助客户确定要购买什么，因此请跟踪用户在新订单中显示产品后是否进行了购买。

2021-03-24 12_27_01-product_sort_ Flags_ Rules_ Development_ Experiment - 云眼.png

保留默认值（衡量_唯一身份转化_次数_的增加_）。

点击添加指标。
将默认的“关闭”变体保留为控件。选择您在上一步中配置的“开”变体：

单击保存。

📘 注意
您不限于两种变体;还可以创建具有多个变体的 A/B 测试。例如：

仔细检查标帜以确保它处于开启状态，以便实验可以运行：

5. 运行 A/B 测试

在终端中，运行以下命令：

Shell

php eyeofcloud-php-quickstart.php

单击终端中的运行以回答命令行提示。输出应类似于以下内容：

PHP

Flag on. User number 1496 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: experiment_1
Pretend that user 1496 made a purchase? y/n
n
Eyeofcloud didn't record a purchase in experiment results for user 1496


Flag off. User number 1194 saw flag variation: off and got products sorted by: alphabetical config variable as part of flag rule: experiment_1
Pretend that user 1194 made a purchase? y/n
y
Eyeofcloud recorded a purchase in experiment results for user 1194


Flag off. User number 5815 saw flag variation: off and got products sorted by: alphabetical config variable as part of flag rule: experiment_1
Pretend that user 5815 made a purchase? y/n
y
Eyeofcloud recorded a purchase in experiment results for user 5815


Flag on. User number 1248 saw flag variation: on and got products sorted by: popular_first config variable as part of flag rule: experiment_1
Pretend that user 1248 made a purchase? y/n
y
Eyeofcloud recorded a purchase in experiment results for user 1248


Flag off. User number 9580 saw flag variation: off and got products sorted by: alphabetical config variable as part of flag rule: experiment_1
Pretend that user 9580 made a purchase? y/n
n
Eyeofcloud didn't record a purchase in experiment results for user 9580


Done with your mocked A/B test.
Check out your report at  https://app.eyeofcloud.com/v2/projects/19957465438/reports
Be sure to select the environment that corresponds to your SDK key

6. 查看 A/B 测试结果

转到“报告”标签以查看实验结果。

结果应如下所示：

📘 注意
在拥有更多用户之前，开发者可能不会看到为标帜变体配置的确切用户流量百分比。
开发者可能不会立即看到用户流量。刷新浏览器以刷新流量。
在有大量访问者（大约 100，000 人）之前，实验结果不会告诉您获胜变体。

7. 工作原理

对于 A/B 测试，需要一种方法来告知云眼用户何时在应用中进行了购买，并将应用代码中的此事件映射到您在云眼中创建的特定事件。幸运的是，SDK有一种方法。使用 Track Event 方法并传入所创建事件的密钥（）。在示例应用中：purchase

PHP

// Track how users behave when they see a flag variation
// e.g., after your app processed a purchase, let Eyeofcloud know what happened:
$user->trackEvent("purchased");

📘 注意
（可选）向事件添加标签以丰富事件（未显示在示例应用中）。还可以使用收入等备用标签键来跟踪定量结果。例如：
PHP
$tags = [
  "category" => "shoes",
  "revenue" => 6432
];
 
$user->trackEvent("purchase", $tags);

目前仅实验规则支持事件跟踪，不支持投放规则。未来变体将支持跟踪交货。

无论哪种方式，在实现标帜时都应包括事件跟踪，因为它可以帮助与第三方分析平台集成，并且在创建 A/B 测试时提供灵活性。

结论

祝贺！您已成功设置并启动了第一个云眼特性标帜(Feature Flag)AB实验。虽然此示例侧重于优化销售，但云眼的实验平台可以支持一组开放式的实验用例。

请参阅我们完整的 PHP SDK 文档，了解使用实验优化软件的更多方法。