Change Array Key Names with PHP

Question

I have an array that has 4 elements with the same key names, for example:

   {
     "Word" : "ok",
     "key_example" : "32",
     "key_example" : "23",
     "key_example" : "21",
     "key_example" : "67"
    }

Is there any easy way that I can loop through this with PHP and change the key names to be:

   {
     "Word" : "ok",
     "key_example_1" : "32",
     "key_example_2" : "23",
     "key_example_3" : "21",
     "key_example_4" : "67"
    }

Possible duplicate of [How to rename array keys in PHP?](http://stackoverflow.com/questions/9605143/how-to-rename-array-keys-in-php) — chris g, Feb 07 '17 at 06:12
It's not possible that you have the above array .. as array can not have same key — M A SIDDIQUI, Feb 07 '17 at 06:12
you are saying you have `an array that has 4 elements with the same key` which is not possible array key are unique — Niklesh Raut, Feb 07 '17 at 06:15
What is this then: "data" : [ { "unicode" : "1f910" }, { "unicode" : "1f5e3" }, { "unicode" : "1f4a9" } ] — user1419810, Feb 07 '17 at 06:17
You must be printing key somewhere, you need to add some count variable there. Show more code. — Hardiksinh Gohil, Feb 07 '17 at 06:18
This will help you : http://stackoverflow.com/a/5917539/2815635 — Niklesh Raut, Feb 07 '17 at 06:19
It's json format bro. First convert into array using json_decode() and then go ahead. — Harsh Barach, Feb 07 '17 at 06:22
Please update you question with exact format and with related name i means use json not array — Niklesh Raut, Feb 07 '17 at 06:22

score 4 · Accepted Answer · answered Feb 07 '17 at 06:30

$string = '[{ "unicode" : "1f910" }, { "unicode" : "1f5e3" }, { "unicode" : "1f4a9" }]';
$array = json_decode($string);
$count = 1;
$final = array();
foreach ($array as $item) {
    $final['unicode_'.$count] = $item->unicode;
    $count++;
}
print_r($final); die;

if you want json then

$final = json_encode($final);

score 0 · Answer 2 · edited Sep 16 '21 at 10:02

0

You could try this:

$newArray = array();
$index = 1;
foreach ($array as $key => $value) {
    if (array_key_exists($key, $array) {
        $newArray[$key . "_" . $i++] = $value;
    }
}

edited Sep 16 '21 at 10:02

13garth

418
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answered Feb 07 '17 at 06:20

Patrick Vogt

828
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what you expect with this code is not possible, array dont have duplicate keys – GRESPL Nagpur Feb 07 '17 at 06:29

score 0 · Answer 3 · answered Sep 16 '21 at 09:18

You can't do what you want because you will only replace the current array item value with each repeated key. But what you are trying to achieve is inline with the below code. Your keys have to be unique. It's how you fetch data from the array. They are your unique identifiers.

Here's an array :

array(
  "a" => "82",
  "b" => "32",
  "c" => "23",
  "d" => "21",
  "e" => "67"
);

You need to unset the array item and then you can set it in the array with the new key. (Heads Up! This is very inefficient. You should just build your array how you want it without using dupe keys.)

Here's how you append onto each key in the array :

$i = 1;
foreach ($array as $key => $value) {
  unset($array[$key]);
  $array[$key . "_" . $i] = $value;
  $i++;
}

print_r($array);

Output :

array(
    [a_1] => 82
    [b_2] => 32
    [c_3] => 23
    [d_4] => 21
    [e_5] => 67
);

Change Array Key Names with PHP

3 Answers3