previous iteration in foreach

Good afternoon,

I am trying to compare in a foreach loop a data with the previous iteration, but I am not able to access this iteration, is there any way?

I need to sort a list, but if there are two equal values ​​they have the same order,
with the array
{
name:"aaaaa", valor:2
name:"bbbbb", valor:10
name:"ccccc", valor:10
name:"ddddd", valor:10
name:"eeeee", valor:45
}
get as a result
{
name:"aaaaa", pos:1
name:"bbbbb", pos:2
name:"ccccc", pos:2
name:"ddddd", pos:2
name:"eeeee", pos:3
}

I am trying to save the pos outside of the foreach in a local variable, or recover the value saved in pos of the previous item

Thank you very much

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