title: convert a SOAP C# client to PHP
body: <p>Good day all.
  I'm converting a C# Soap client in PHP, with many troubles.
  I don't know C# but the syntax is quite legible, so I don't have many problems, until now.</p>
  
  <p>these are the lines I can't understand:</p>
  
  <pre><code>My_Arx_Search.Field_String campo = ((My_Arx_Search.Field_String)aggSearch);
  campo.Operatore = My_Arx_Search.Dm_Base_Search_Operatore_String.Uguale;
  campo.Valore = "DFLMHLD15GGFD..."; 
  </code></pre>
  
  <p>What I actually know is:
  <code>My_Arx_Search</code> is (I suppose) an instance of the xml of the wsdl (there is a file called the same, which is exactly that).
  how I can manage these 2 lines in php? anyone can help me in that?
  thanks in advance.</p>