replace array keys with given respective keys

user_425648 0
Viewed 32737

I have an array like below

$old = array(
       'a' => 'blah',
       'b' => 'key',
       'c' => 'amazing',
       'd' => array(
                0 => 'want to replace',
                1 => 'yes I want to'
              )
       );

I have another array having keys to replace with key information.

$keyReplaceInfoz = array('a' => 'newA', 'b' => 'newB', 'c' => 'newC', 'd' => 'newD');

I need to replace all keys of array $old with respective values in array $keyReplaceInfo.

Output should be like this 

$old = array(
       'newA' => 'blah',
       'newB' => 'key',
       'newC' => 'amazing',
       'newD' => array(
                0 => 'want to replace',
                1 => 'yes I want to'
              )
       );

I had to do it manually as below. I am expecting better option. can anyone suggest better way to accomplish this?

$new = array();
foreach ($old as $key => $value)
{
     $new[$keyReplaceInfoz[$key]] = $value;
}

I know this can be more simpler.

array-key multidimensional-array arrays php
11 Answers
array_combine(
    ['newKey1', 'newKey2', 'newKey3'],
    array_values(['oldKey1' => 1, 'oldKey2' => 2, 'oldKey3' => 3])
);

This should do the trick as long as you have the same number of values and the same order.

user_22456800

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

user_70429470

This question is old but since it comes up first on Google I thought I'd add solution.

// Subject
$old = array('foo' => 1, 'baz' => 2, 'bar' => 3));

// Translations    
$tr  = array('foo'=>'FOO', 'bar'=>'BAR');

// Get result
$new = array_combine(preg_replace(array_map(function($s){return "/^$s$/";}, 
           array_keys($tr)),$tr, array_keys($old)), $old);

// Output
print_r($new);

Result:

    
    Array
    (
       [FOO] => 1
       [baz] => 2
       [BAR] => 3
    )
user_3081450

This works irrespective of array order & array count. Output order & value will be based on replaceKey.

$replaceKey = array('a' => 'newA', 'b' => 'newB', 'c' => 'newC', 'd' => 'newD', 'e' => 'newE','f'=>'newF');

$array = array(
       'a' => 'blah',
       'd' => array(
                0 => 'want to replace',
                1 => 'yes I want to'
              ),
       'noKey'=>'RESIDUAL',
       'c' => 'amazing',
       'b' => 'key',
       );

$filterKey = array_intersect_key($replaceKey,$array);
$filterarray = array_intersect_key(array_merge($filterKey,$array),$filterKey);

$replaced = array_combine($filterKey,$filterarray);

//output
var_export($replaced);
//array ( 'newA' => 'blah', 'newB' => 'key', 'newC' => 'amazing', 'newD' => array ( 0 => 'want to replace', 1 => 'yes I want to' ) )
user_56641710

If you're looking for a recursive solution to use on a multidimensional array, have a look at the below method. It will replace all keys requested, and leave all other keys alone.

/**
 * Given an array and a set of `old => new` keys,
 * will recursively replace all array keys that
 * are old with their corresponding new value.
 *
 * @param mixed $array
 * @param array $old_to_new_keys
 *
 * @return array
 */
function array_replace_keys($array, array $old_to_new_keys)
{
    if(!is_array($array)){
        return $array;
    }

    $temp_array = [];
    $ak = array_keys($old_to_new_keys);
    $av = array_values($old_to_new_keys);

    foreach($array as $key => $value){
        if(array_search($key, $ak, true) !== false){
            $key = $av[array_search($key, $ak)];
        }

        if(is_array($value)){
            $value = array_replace_keys($value, $old_to_new_keys);
        }

        $temp_array[$key] = $value;
    }

    return $temp_array;
}

Using OP's example array:

$old = array(
       'a' => 'blah',
       'b' => 'key',
       'c' => 'amazing',
       'd' => array(
                0 => 'want to replace',
                1 => 'yes I want to'
              )
       );
$replace = ["a" => "AA", 1 => 11];

var_export(array_replace_keys($old, $replace));

Gives the following output:

array (
  'AA' => 'blah',
  'b' => 'key',
  'c' => 'amazing',
  'd' => 
  array (
    0 => 'want to replace',
    11 => 'yes I want to',
  ),
)

DEMO

Inspired by the following snippet.

user_4290710

This uses @Summoner's example but keeps @Leigh's hint in mind:

$start = microtime();
$array = [ "a" => 1, "b" => 2, "c" => 3 ];

function array_replace_key($array, $oldKey, $newKey) {
    $keys = array_keys($array);
    $idx = array_search($oldKey, $keys);
    array_splice($keys, $idx, 1, $newKey);
    return array_combine($keys, array_values($array));
}

print_r(array_replace_key($array, "b", "z"));
user_74511090
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