given a sorted integer array, return a new integer array without duplicates

I have to write a function that given a sorted integer array would return a new integer array without duplicates.
What is the best solution? Is there better solution than looping through the whole array and checking if the value has changed?
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If your array is already sorted, then the best is indeed to loop through it, adding the value to your new array if it differs from the last value.

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looping is the only way of doing it.

first read the values in array1
start creating the new array
check for the values if they are existing in the new array before adding it
                      $prev = "not equal to $in[0]";
                       @out = grep($_ ne $prev && ($prev = $_, 1), @in);
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