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

You could use array_combine.

$new_arr = array_map(function ($val) {
  return array_combine(array('x', 'y'), $val);
}, $arr);

The working demo.

Or just ues a loop:

foreach ($arr as &$el) {
  $el = array_combine(array('x', 'y'), $el);
}