PHP rename the keys of an array

Question

How can I rename keys in an array?

Start with this array named $start_array,

[0] => 
      [date] => 2012-05-01
      [revenue] => 100
[1]          


        

Answer 1

$new_keys = array( 'old1'=>'new1', 'old2'=>'new2', ... );
foreach( $array as $key=>$value ) $newarray[$new_keys[$key]]=$value;