PHP阵列及其位置需要三个最高值（或更多，如果并列）？

I have an array. I'd like to get the three highest values of the array, but also remember which part of the array it was in.

For example, if my array is [12,3,7,19,24], my result should be values 24,19,12, at locations 4, 0, 3.

How do I do that? The first part is easy. Getting the locations is difficult.

Secondly, I'd like to also use the top three OR top number after three, if some are tied. So, for example, if I have [18,18,17,17,4], I'd like to display 18, 18, 17, and 17, at location 0,1,2,3.

Does that make sense? Is there an easy way to do that?

Wouldn't you be there using asort()?

For example:

<?php
$list = [4,18,18,17,17];

// Sort maintaining indexes.
asort($list);

// Slice the first 3 elements from the array.
$top3 = array_slice($list, -3, null, true);

// Results in: [ 1 => 18, 2 => 18, 3 => 17 ]

Or you can use arsort

function getMyTop($list, $offset, $top) {
    arsort($list);
    return array_slice($list, $offset, $top, true);
}

$myTop = getMyTop($list, 0, 3);
$myNextTop = getMyTop($list, 3, 4);

This is what you need!

<?php
$array = array(12,3,7,19,24);
$array_processed = array();
$highest_index = 0;

while($highest_index < 3)
{
    $max = max($array);
    $index = array_search($max,$array);
    $array_processed[$index] = $max;
    unset($array[$index]);

    $highest_index++;
}

print_r($array_processed);
?>

You will get Index as well as the value! You just have to define how many top values you want! Let me know if it's what you want!

function top_three_positions($array){

  // Sort the array from max to min
  arsort($array);

  // Unset everything in  sorted array after the first three elements
  $count = 0;
  foreach($array as $key => $ar){
    if($count > 2){
       unset($array[$key]);
    }
    $count++;
  }

  // Return array with top 3 values with their indexes preserved.
  return $array;
}

You can use a loop to determine how many elements your top-three-with-ties will have, after applying arsort:

function getTop($arr, $num = 3) {
    arsort($arr);
    foreach(array_values($arr) as $i => $v) {
        if ($i >= $num && $v !== $prev) return array_slice($arr, 0, $i, true);
        $prev = $v;
    }
    return $arr;
}

// Sample input
$arr = [4,18,17,6,17,18,9];
$top = getTop($arr, 3);
print_r($top); // [5 => 18, 1 => 18, 4 => 17, 2 => 17]