how to set web.config default page for php index file - iis

Question

I'm trying to start my web site on iis server and I use php for that.
every thing is fine on server but defaultDocument.
how can I set that on web.config file.
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<defaultDocument enabled="true">
<files>
<remove value="default.aspx" />
<remove value="iisstart.htm" />
<remove value="index.html" />
<remove value="index.htm" />
<remove value="Default.asp" />
<remove value="Default.htm" />
<add value="index.php" />
</files>
</defaultDocument>
</system.webServer>
</configuration>
this is the default xml and I try other thing like:
<clear />
or try to remove other pages...
any Idea how can I set this file?

Answer 1

after some more researches, the only suitable config was this...
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<defaultDocument>
<files>
<clear />
<add value="index.php" />
<add value="index.html" />
<add value="index.htm" />
</files>
</defaultDocument>
</system.webServer>
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SqlServerCe.4.0" />
<add invariant="System.Data.SqlServerCe.4.0" name="Microsoft® SQL Server® Compact 4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
</DbProviderFactories>
</system.data>
</configuration>