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

Old question, and already answered, but if you have an associative array you can use array_merge.

$arr = array_merge([$key=>$arr[$key]], $arr);

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EDITED (above to show PHP7+ notation, below is example)

$arr = ["a"=>"a", "b"=>"b", "c"=>"c", "d"=>"d"];
$arr = array_merge(["c"=>$arr["c"]], $arr);

The effective outcome of this operation

$arr == ["c"=>"c", "a"=>"a", "b"=>"b", "d"=>"d"]