phparrayssortingasort

asort PHP Array and keep one entry at the top

I have a PHP array

I want to sort it alphabetically and keep a precise entry at the top:

$arr = array ("Orange", "Banana", "Strawberry", "Apple", "Pear");
asort($arr);

Now this will output:

Apple, Banana, Orange, Pear, Strawberry

I want it to keep Orange as the first entry then reorder the others:

Orange, Apple, Banana, Pear, Strawberry

Thanks.

Solution

  • Get first element from array, then return it back:

    $arr = array ("Orange", "Banana", "Strawberry", "Apple", "Pear");

$first = array_shift($arr);
asort($arr);
array_unshift($arr, $first);

    Update with unknown orange position:

    $arr = array ("Banana", "Orange", "Strawberry", "Apple", "Pear"); 
// $k is index of "Orange" in array
$k = array_search('Orange', $arr);
// store element with founded $k in a variable 
$orange = $arr[$k];
// remove $k element from $arr
// same as `unset($arr[$k]);`
array_splice($arr, $k, 1);
// sort 
asort($arr);
// add element in the beginning
array_unshift($arr, $orange);