从包含相同值的数组中获取x最高值

Question

I'm using the following code to retrieve the highest 3 numbers from an array.

$a = array(1,2,5,10,15,20,10,15);
arsort($a, SORT_NUMERIC);
$highest = array_slice($a, 0, 3);

This code correctly gives me the highest three numbers array(20,15,10); however, I'm interested in getting the highest 3 numbers including the ones that are identical. In this example, I'm expecting to get an array like array(10, 10, 15, 15, 20)

Answer 1

Might be simpler but my brain is tired. Use arsort() to get the highest first, count the values to get unique keys with their count and slice the first 3 (make sure to pass true to preserve keys):

arsort($a, SORT_NUMERIC);
$counts = array_slice(array_count_values($a), 0, 3, true);

Then loop those 3 and fill an array with the number value the number of times it was counted and merge with the previous result:

$highest = array();

foreach($counts as $value => $count) {
    $highest = array_merge($highest, array_fill(0, $count, $value));
}