unique array problem

[suresh kumar <asureshkumar_1983@xxxxxxxxxxx>]

I am facing one project in my project .
   
  this is my  code:
   
  a=array(0=>10,1=>10,2=>20,3=>30,4=>30,5=>40);
  b=array();
  b=array_unique($a);
  print_r($b); 
  o/p  getting from above code is  b[0]=10,b[2]=20,b[3]=30,b[5]=40;
   
  but i want the o/p be b[0]=10,b[1]=20,b[2]=30,b[3]=40;
   
  i searched php.net .i am not able to fine any solution.i am breaking my head for last  5 hours.i am waiting reply from any one
   
   
   
   

				
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