replace array keys with given respective keys

Question

I have an array like below

$old = array(
       \'a\' => \'blah\',
       \'b\' => \'key\',
       \'c\' => \'amazing\',
       \'d\' => array(
          


        

Answer 1

IMO using array_combine, array_merge, even array_intersect_key is overkill. The original code is good enough, and very fast.