php-doc-en/reference/com/functions/class.dotnet.xml

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 <refentry id="class.dotnet">
  <refnamediv>
   <refname>DOTNET</refname>
   <refpurpose>DOTNET class</refpurpose>
  </refnamediv>
  <refsynopsisdiv>
  <synopsis>$obj = new <classname>DOTNET</classname>("assembly", "classname")</synopsis>
  </refsynopsisdiv>
  <refsect1 id="class.dotnet.class">
   <title>Description</title>
   <simpara>
    The DOTNET class allows you to instantiate a class from a .Net assembly and
    call its methods and access its properties.
   </simpara>
  </refsect1>
  <refsect1 id="class.dotnet.constructor">
   <title>Methods</title>
    <methodsynopsis>
     <type>string</type><methodname>DOTNET::DOTNET</methodname>
     <methodparam><type>string</type><parameter>assembly_name</parameter></methodparam>
     <methodparam><type>string</type><parameter>class_name</parameter></methodparam>
     <methodparam choice="opt"><type>int</type><parameter>codepage</parameter></methodparam>
    </methodsynopsis>
   <para>
    DOTNET class constructor.  <parameter>assembly_name</parameter> specifies
    which assembly should be loaded, and <parameter>class_name</parameter>
    specifices which class in that assembly to instantiate.  You may
    optionally specify a <parameter>codepage</parameter> to use for unicode
    string transformations; see the <xref linkend="class.com"/> class
    for more details on code pages.
   </para>

   <para>
    The returned object is an overloaded object, which means that PHP does
    not see any fixed methods as it does with regular classes; instead, any
    property or method accesses are passed through to COM and from there to
    DOTNET.  In other words, the .Net object is mapped through the COM
    interoperability layer provided by the .Net runtime.
   </para>

   <para>
    Once you have created a DOTNET object, PHP treats it identically to any
    other COM object; all the same rules apply.
   </para>
   
   <para>
    <example id="example.dotnet">
     <title>DOTNET example</title>
     <programlisting role="php">
<![CDATA[
<?php
  $stack = new DOTNET("mscorlib", "System.Collections.Stack"); 
  $stack->Push(".Net"); 
  $stack->Push("Hello "); 
  echo $stack->Pop() . $stack->Pop(); 
?>
]]>
     </programlisting>
    </example>
   </para>

   <note>
    <para>
     You need to install the .Net runtime on your web server to take advantage
     of this feature.
    </para>
   </note>
  </refsect1>
 </refentry>

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