Associative array move last element to first

Question

I have an array

array(
'key1'=>'value1',
'key2'=>'value2',
'key3'=>'value3'
)

I want create it like

array(
'key3'=>'value3',
'key1'=>'value1',
'key2'=>'value2'
)

I just want to move the last element to first with key value pair keeping all other details as it is.

Neither you nor your code should know or care about what order an associative array's keys are in - often it is unspecified, and it doesn't matter anyway. If you care about order, use a numeric array. — michaelb958--GoFundMonica, May 03 '13 at 12:03
It is an associative array. Actual this is not my real array. — Satyendra Mishra, May 04 '13 at 15:04
The real array is very big so I just entered a sample. Anyways I got my answer from the below mentioned post. — Satyendra Mishra, May 04 '13 at 15:06
`$firstAsLast = array_merge(array_splice($array, 1), $array);` or `$lastAsFirst = array_merge(array_splice($array,-1), $array);` — yckart, Apr 30 '15 at 14:10
This should be reopened IMO, but I lack the rep to do so. The close reason provided is absurd - this is extremely clear and answerable. This *does* matter in some cases: consider an array of 50 states (`'AK' => 'Alaska') that is unsorted. Outputting it with a `foreach` would output it in the unsorted fashion. Sorting/determining the order of associative arrays is **encouraged** by the PHP manual by it's implementation of [`ksort()`](http://php.net/manual/en/function.ksort.php) which *specifically calls out being useful for assoc arrays*. — HPierce, Nov 25 '15 at 19:09
I tried finding a duplicate, but could not find one either. [This question](http://stackoverflow.com/questions/12696330/associative-array-move-an-element-to-first-position) has a very relevant title, but is premised on the fact that elements are added to the array to be sorted - thus, justifying it's marked duplicate. This one does not use that premise and might be useful if an array is provided by a 3rd party library. — HPierce, Nov 25 '15 at 19:14

nvanesch · Answer 1 · 2013-05-03T12:16:58.550

15

Just a matter of splicing it and merging it to the beginning

$array = array(
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => 'value3'
);

$newArray = array_merge(array_splice($array, -1), $array);

var_dump($newArray);

Output:

array(3) {
  ["key3"]=>
  string(6) "value3"
  ["key1"]=>
  string(6) "value1"
  ["key2"]=>
  string(6) "value2"
}

edited May 03 '13 at 12:16

answered May 03 '13 at 12:03

nvanesch

2,540
14
25

score 13 · Accepted Answer · edited Nov 13 '19 at 11:07

13

simplest way to do with below code

$arr = array(
'key1'=>'value1',
'key2'=>'value2',
'key3'=>'value3'
);

$lastvalue = end($arr);
$lastkey = key($arr);

$arr1 = array($lastkey=>$lastvalue);

array_pop($arr);

$arr1 = array_merge($arr1,$arr);

OUTPUT

Array
(
    [key3] => value3
    [key1] => value1
    [key2] => value2
)

edited Nov 13 '19 at 11:07

Dharman

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answered May 03 '13 at 12:35

liyakat

11,825
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40
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3

Quick and clean, move last to first element: $element = array_pop( $array ); array_unshift( $array, $element ); – elvismdev Sep 11 '17 at 09:56
array_unshift($arr, $last = array_pop($arr)); – alsator Aug 15 '18 at 07:16
This never worked for me. Try this one: array_unshift($hoursArray,$hoursArray[sizeof($hoursArray)-1]); array_pop($hoursArray); – Ariel Terrani Dec 11 '18 at 19:39

score 0 · Answer 3 · answered May 03 '13 at 12:05

0

User the function array_reverse() to reverse the array, Like :

<?php
$arr=array(
   'key1'=>'value1',
   'key2'=>'value2',
   'key3'=>'value3'
);
$reversed = array_reverse($arr);
echo "<pre>";
print_r($reversed);
?>

answered May 03 '13 at 12:05

Vinod VT

6,946
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I dont have to reverse the complete array. – Satyendra Mishra May 03 '13 at 12:15
too much complexity for simple work. – Notepad May 03 '13 at 19:24

score 0 · Answer 4 · answered May 03 '13 at 12:34

$array = array(
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => 'value3'
);

$count = 1;
foreach ($array as $k => $v) {
    if ($count == 1)
        $first[$k] = $v;
    if ($count == count($array))
        $last[$k] = $v;

    $count++;
}

array_shift($array);
array_pop($array);
$final = array_merge($last, $array, $first);
print_r($final);

Notepad · Answer 5 · 2013-05-03T19:23:54.473

0

first goto last item or array, use end(fastest one) for that purpose.Now fetch key,value then delete it and add to top.

$last_val = end($original_array);
$last_key = key($original_array);
unset($original_array[$key]);
$new_array = array($last_key => $last_val) + $original_array;

edited May 03 '13 at 19:23

answered May 03 '13 at 13:02

Notepad

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Associative array move last element to first

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