Move array item with certain key to the first position in an array, PHP

Question

What\'s the most elegant way in PHP to move an array element chosen by key to the first position?

Input:

$arr[0]=0;
$arr[1]=1;
$arr[2]=2;
....
$arr[n         


        

Answer 1

Something like this should work. Check if the array key exists, get its value, then unset it, then use array_unshift to create the item again and place it at the beginning.

if(in_array($key, $arr)) {
    $value = $arr[$key];
    unset($arr[$key]);
    array_unshift($arr, $value);
}

Answer 2

$arr[0]=0;
$arr[1]=1;
$arr[2]=2;
$arr[3]=10;


$tgt = 10;
$key = array_search($tgt, $arr);
unset($arr[$key]);
array_unshift($arr, $tgt);

// var_dump( $arr );
array
0 => int 10
1 => int 0
2 => int 1
3 => int 2