changing the key description in php array issue - php

Question

I have an array like the one below
Array
(
[0] => Array
(
[name] => Alex
[age] => 30
[place] => Texas
)
[1] => Array
(
[name] => Larry
[age] => 28
[place] => Memphis
)
)
How would I change the key names? Like "name" to "firstname", "age" to "years", "place" to "address"?

Answer 1

Use a foreach loop to iterate over your array, and then use array_combine in conjunction with array_values() to create the new array:
$keys = array('firstname', 'years', 'address');
foreach ($array as & $subarr) {
$subarr = array_combine($keys, array_values($subarr));
}
print_r($array);
Output:
Array
(
[0] => Array
(
[firstname] => Alex
[years] => 30
[address] => Texas
)
[1] => Array
(
[firstname] => Larry
[years] => 28
[address] => Memphis
)
)
Online demo

Answer 2

array_map is your friend,
$users = array_map(function($user) {
return array(
'firstname' => $user['name'],
'years' => $user['age'],
'location' => $user['place']
);
}, $users);
DEMO.

Answer 3

I believe that the only way to do this is to create a new array and assign each value with old key to value with new key.
<?php
//$originalArray is array from the question.
for($i=0; $i<=count($originalArray); $i++){
$originalArray[$i] = rekeyArray($originalArray[$i]);
}
function rekeyArray($a){
$result = array();
if(isset($a['name']))
$result['firstname'] = $a['name'];
if(isset($a['age']))
$result['years'] = $a['age'];
if(isset($a['place']))
$result['address'] = $a['place'];
return $result;
}
?>