Unsort in array

Question

Good day.

I would be like get 3 keys from $arr where value $arN[0] will be more than other...

Code:

$ar1=array(201,281);
$ar2=array(1252760,1359724);
$ar3=array(452760,34349724);
$ar4=array(1260,134344);
$ar5=array(232750,1359724);
$ar6=array(60,1439724);

$arr[]=array(6299927 => $ar1);
$arr[]=array(1252760 => $ar2);
$arr[]=array(3432444 => $ar3);
$arr[]=array(3435543 => $ar4);
$arr[]=array(7645466 => $ar5);
$arr[]=array(4574534 => $ar6);

Next function sorting array $a descending:

function cmp($a, $b)
{
    if ($a == $b) {
        return 0;
    }
    return ($a < $b) ? 1 : -1;
}

$a = array(3, 2, 5, 6, 1);

usort($, "cmp");

foreach ($a as $key => $value) {
    echo "$key: $value\n";
}
outpoot: 0:6 1:5 2:4 3:2 4:1

But how change this function for my example(for my big array)?

Tell me please how make this?

How write right?

Do you want to get the index, if 201 is greater than 281 or 201 is greater than 1252760? — Starx, Jun 29 '13 at 02:00
possible duplicate of [How do I sort a multidimensional array in php](http://stackoverflow.com/questions/96759/how-do-i-sort-a-multidimensional-array-in-php) — Barmar, Jun 29 '13 at 02:05
This is a very strange array. Each element of the array is an associative array with just one element with a different key. Why don't you use those as the keys of `$arr`? — Barmar, Jun 29 '13 at 02:18

Starx · Answer 1 · 2013-06-29T02:14:54.513

0

Very confusing but I think you are looking for something like this. It will give you the index of the array whose first item is greater than the first item in the next array.

foreach($arr as $key => $array) {
    if($array[0] > $arr[$key+1][0]) {
       echo $key;
    }
}

edited Jun 29 '13 at 02:14

answered Jun 29 '13 at 01:57

Starx

72,283
42
174
253

@Alex, Of course my code is working. I think you meant, you are not getting the result you expected. – Starx Jun 29 '13 at 02:39

score 0 · Answer 2 · answered Jun 29 '13 at 02:21

$dates = array();
foreach ($arr as $key => $row) {
    $subkeys = array_keys($row); // Elements are one-element associative arrays
    $dates[$key]  = $row[$subkeys[0]][0]; // Get the element, then get its [0] sub-element

}
array_multisort($dates, SORT_DESC, $arr);
print_r($arr);

score 0 · Answer 3 · answered Oct 20 '16 at 09:31

$ans_array= array();

            // for shuffle array without repeat
            for($q=0;$q<count($arr);$q++)
            {
                $n = rand(0,count($arr));
                if($ans_array[$n] == NULL || $ans_array[$n] == '')
                {   
                     $ans_array[$n] = $arr[$q];
                }
                else
                {     if($q==0) $q=0;
                      else $q = $q-1;
                }
            }

Unsort in array

3 Answers3