variant_xor
  Performs a logical exclusion on two variants
  
 
  Description
  
   mixed variant_xor
    ( mixed $left
   , mixed $right
   )
  
  
 
  Parameters
  
   
    
     - 
left
- 
      
       The left operand.
       
- 
right
- 
      
       The right operand.
       
Note: 
 As with all the variant arithmetic functions, the parameters for this function
 can be either a PHP native type (integer, string, floating point, boolean or
 NULL), or an instance of a COM, VARIANT or DOTNET class.  PHP native types
 will be converted to variants using the same rules as found in the constructor
 for the VARIANT class.  COM and DOTNET objects
 will have the value of their default property taken and used as the variant value.
 The variant arithmetic functions are wrappers around the similarly named
 functions in the COM library; for more information on these functions, consult
 the MSDN library.  The PHP functions are named slightly differently; for example
 variant_add in PHP corresponds to VarAdd()
  in the MSDN documentation.
  
  
 
  Return Values
  
   
    Variant XOR Rules
    
     
      
       | If leftis | If rightis | then the result is | 
     
     
      | TRUE | TRUE | FALSE | 
      | TRUE | FALSE | TRUE | 
      | FALSE | TRUE | TRUE | 
      | FALSE | FALSE | FALSE | 
      | NULL | NULL | NULL |