How to reorder elements in an array when many values are empty?

Question

I have a list array

array([img1] => "", [img2] => "AJKH.png", [img3] => "", [img4] => "")
array([img1] => "", [img2] => "AJKH.png", [img3] => "IHGF.png", [img4] => "")

How to reorder when some value in array are empty. How ideas?

array([img1] => "AJKH.png", [img2] => "", [img3] => "", [img4] => "")
array([img1] => "AJKH.png", [img2] => "IHGF.png", [img3] => "", [img4] => "")

You can try sorting the array. Also if its fine, you can loop though the array and unset the empty spaces. — Ajit Kumar Singh, Dec 17 '15 at 07:33
Take a look at http://stackoverflow.com/questions/9395395/php-how-to-move-the-empty-values-of-an-array-to-its-last-positions — Matt, Dec 17 '15 at 07:33

score 1 · Answer 1 · answered Dec 17 '15 at 16:27

The proposed duplicate is almost the same, but this one seems a little different because it looks like you want to keep your keys in the same order (not maintain key-value association) and just move the values around based on whether or not they are empty. This should do that:

$new_array = array_fill_keys(array_keys($array), '');
foreach ($array as $value) {
    if ($value) {
        $new_array[key($new_array)] = $value;
        next($new_array);
    }
}

score 0 · Answer 2 · answered Dec 17 '15 at 07:35

An easy approach is to have 2 arrays and merge them (it will be better, rather than swapping in terms of computation).

$empty=array();
$full=array();

foreach($yourArray  as $value){
if($value==""){
    $empty[]=$value;
}
else{
   $full[]=$value;
}
}

$result = array_merge($full, $empty);

Another approach is to write an algorithm that will check the position of the element (empty) and swap them. Bring all the empty on the end.

How to reorder elements in an array when many values are empty?

2 Answers2