Re-mapping an array.

Can anyone show me how I can re-map an array using the following criteria.

For example I have two arrays:
I wish to create a new array using the values on arr2 as the indexes on arr1.
For example arr1[arr2[0]] would be 140 and so on.

Final output of the new array would [140,201,731,188,123,172];

For a small amount of numbers I could use push but arr1 and arr2 could potentially have a lot of numbers....

Re-mapping an array. WordPress ...