Configuring web servers: IIS

When you use IIS, host the application in a virtual host (Website) where the document root points to the path/to/app/public folder and configure the website to run PHP. In that public folder, place a file named web.config at path/to/app/public/web.config. Use the following content:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <directoryBrowse enabled="false" />
        <rewrite>
            <rules>
                <rule name="Hide Yii Index" stopProcessing="true">
                    <match url="." ignoreCase="false" />
                    <conditions>
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" 
                            ignoreCase="false" negate="true" />
                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" 
                            ignoreCase="false" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="index.php" appendQueryString="true" />
                </rule> 
            </rules>
      </rewrite>
    </system.webServer>
</configuration>

Also, the following list of Microsoft's official resources could be useful to configure PHP on IIS:

1. How to set up your first IIS website
2. Configure a PHP Website on IIS