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Array Key same but add values to the vlaues? [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit t开发者_运维知识库he help center. Closed 11 years ago.
This my array....  

         Array
        (
            [a1]=>'k'
            [a2]=>'a' 
            [a3]=>'w'
            [a4]=>'z'

         }

i want     Array
        (
            [a1]=>'k,a' 
            [a3]=>'w'
            [a4]=>'z'

         }


$arr = ...;
unset($arr['Â 7'], $arr['Â 11']);
$arr[6]  = 7;
$arr[10] = 11;
0

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