Add the phase to the end of the array. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- item
-  Type:  Autodesk.Revit.DB Phase  
 The phase to be added.