解决这个问题的方法是用用户界面能够识别的标签更新web.config文件。

我使用这个在IIS上安装PHP：

<InstallExecuteSequence>

      <Custom Action="CreateFastCGI" Before="InstallFinalize">
          <![CDATA[NOT Installed AND VersionNT64 >= 600]]>
      </Custom>
      <Custom Action="AddHandlerMappingsIIS2" Before="InstallFinalize">
          <![CDATA[NOT Installed AND VersionNT64 >= 600]]>
      </Custom>

  </InstallExecuteSequence>

  <CustomAction Id="CreateFastCGI" Execute="deferred" Impersonate="no" Return="check" Directory="TARGETDIR"
                ExeCommand="[SystemFolder]inetsrv\appcmd set config /section:system.webServer/fastCGI /+[\[]fullPath=&#39;[ApplicationPhpDirectory]php-cgi.exe&#39;[\]]" />
  <CustomAction Id="AddHandlerMappingsIIS2" Execute="deferred" Impersonate="no" Return="check" Directory="TARGETDIR"
                ExeCommand="[SystemFolder]inetsrv\appcmd set config /section:system.webServer/handlers /+[\[]name=&#39;PHP_via_FastCGI&#39;,path=&#39;*.php&#39;,verb=&#39;*&#39;,modules=&#39;FastCgiModule&#39;,scriptProcessor=&#39;[ApplicationPhpDirectory]php-cgi.exe&#39;,resourceType=&#39;Unspecified&#39;[\]]" />

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