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

Old name of the key of array is 'name' and new name is 'new_name'

$myrow=array('name'=>'Sabuj'); 
$myrow['new_name']=$myrow['name'];
unset($myrow['name']);
print_r($myrow);

Result: Array ( [new_name] => 'Sabuj' )

Answer 2

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

Answer 3

foreach( $start_array as &$arr ) {
  $arr["x"] = $arr['date'];
  unset( $arr['date'] );
  $arr['y'] = $arr['revenue'];
  unset( $arr['revenue'] );
}
unset($arr);

Try the above code.

Answer 4

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);
}